feat: 独立词库、三向认词与当日快闪复习

## 独立词库理解词原先只能跟着课程单元走，学完 A0 十课词汇量只增加约 22 个实词，不足以解决"记不住单词"。新增一份独立词库 assets/words/wordbank.json （2748 词，A1–B1），挂进 receptiveWordRegistry 的合成单元 bank-A1/A2/B1，完全复用理解词已有的状态机，不依赖课程进度，第一天就能用。数据来源、许可与合成规则记在 tool/words/DATA-NOTE.md：CEFR-J 定等级、公开词书提供音标、AI 重写全部释义并生成例句、OpenSubtitles 提供口语词频。词书部分为 CC BY-NC-SA 4.0 且上游权利不明，仅供个人非商用；若要分发或上架，须替换音标那一列。 ## 背单词机制 - 间隔阶梯 1/3/7/15/30/60/120 天，连续答对上一级，答错回第一级。原先首次答对后要等 7 天才复习，正是"第二天就忘"的成因。 - 每日新词上限（10 分钟 8 个 / 20 分钟 15 个 / 30 分钟 20 个）。阶梯第一级是次日，今天引入的新词就是明天的工作量。 - 新词按口语频率发放，不再按字母序 —— A1 从 a.m./ability 变成 no/not/know/just。 - 三个方向按层级轮转：看词（英→中）→ 听词（音→中）→ 想词（中→英）。想词题仍是选择题，不要求产出，理解词定位不变，不进升级分母。 - 单词页独立成 tab，首页今日任务卡下方给一张认词入口卡。 ## 用法对照课程 JSON 增加 usage 字段（when/reply/swap/confuse）：一个句型用在什么场合、对方通常怎么答、还能怎么说、跟哪个学过的句型容易混。知道 How are you? 的意思，不等于知道它不是用来问名字的。 ## 复习流 - 当日快闪（recap）独立成队列，不占复习预算，也不计入积压。 - 只发放当日预算内的量，其余保持到期状态等下次，不悄悄丢弃或改期。 - 答错的项隔几题后回来，而不是立刻重问。测试 296 通过，flutter analyze 干净。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-20 23:54:17 +09:00
parent 1a10ca88e0
commit 6b42b7abc3
52 changed files with 4044 additions and 82 deletions
@@ -77,6 +77,17 @@
          "sentence": "I’m Tom.",
          "meaning": "我是 Tom。"
        }
+      },
+      "usage": {
+        "when": "想让对方知道你叫什么，自我介绍的时候说。",
+        "reply": "对方通常回一句 Nice to meet you.",
+        "swap": "My name is Tom. 意思一样，正式一点。",
+        "confuse": [
+          {
+            "id": "A0-P02",
+            "note": "What's your name? 是问对方，I'm Tom. 是说自己；别人问了你才用这句回答。"
+          }
+        ]
      }
    },
    {
@@ -95,6 +106,24 @@
          "sentence": "What’s your name?",
          "meaning": "你叫什么名字？"
        }
+      },
+      "usage": {
+        "when": "你想知道对方叫什么名字。",
+        "reply": "对方会回 I'm Tom. 或 My name is Tom.",
+        "confuse": [
+          {
+            "id": "A0-P01",
+            "note": "I'm Tom. 是回答，What's your name? 是提问；想知道对方名字才用这句。"
+          },
+          {
+            "id": "A0-P05",
+            "note": "How are you? 问的是对方今天状态好不好，不是名字；见面先问好，想认识对方才问名字。"
+          },
+          {
+            "id": "A0-P07",
+            "note": "What's your phone number? 问的是号码；两句都以 What's your 开头，区别全在后面那个词。"
+          }
+        ]
      }
    },
    {
@@ -112,6 +141,20 @@
          "sentence": "Nice to meet you.",
          "meaning": "很高兴认识你。"
        }
+      },
+      "usage": {
+        "when": "刚认识、知道对方名字之后，说一句客气话。",
+        "reply": "对方会回 Nice to meet you, too.",
+        "confuse": [
+          {
+            "id": "A0-P01",
+            "note": "I'm Tom. 是告诉对方你叫什么，Nice to meet you. 是知道名字之后才说的客气话。"
+          },
+          {
+            "id": "A0-P05",
+            "note": "How are you? 是在问状态，要回答好不好；Nice to meet you. 只是客气话，不用回答。"
+          }
+        ]
      }
    }
  ],
@@ -22,6 +22,20 @@
          "sentence": "How do you spell that?",
          "meaning": "那个怎么拼写？"
        }
+      },
+      "usage": {
+        "when": "听到一个词（多半是名字），但不确定怎么写。",
+        "reply": "对方会一个字母一个字母念给你听。",
+        "confuse": [
+          {
+            "id": "A0-P02",
+            "note": "What's your name? 是问对方叫什么，How do you spell that? 是已经听到了名字、只是不知道怎么写。"
+          },
+          {
+            "id": "A0-P20",
+            "note": "Please say that again. 是没听清、要对方重说；这句是听清了、只是不会写。"
+          }
+        ]
      }
    }
  ],
@@ -75,6 +75,16 @@
          "sentence": "How are you?",
          "meaning": "你怎么样？"
        }
+      },
+      "usage": {
+        "when": "见面打招呼，问对方今天好不好。",
+        "reply": "对方会回 I'm good. / I'm okay. / I'm tired.",
+        "confuse": [
+          {
+            "id": "A0-P02",
+            "note": "What's your name? 问的是名字；见面先说 How are you? 打招呼，想认识对方才问名字。"
+          }
+        ]
      }
    },
    {
@@ -98,6 +108,17 @@
          "sentence": "I’m tired today.",
          "meaning": "我今天很累。"
        }
+      },
+      "usage": {
+        "when": "别人问你 How are you? 的时候，说出你今天的状态。",
+        "reply": "说完可以反问一句 How are you?",
+        "swap": "熟悉的人之间也可以只说 Good. 或 Okay.",
+        "confuse": [
+          {
+            "id": "A0-P01",
+            "note": "I'm Tom. 说的是名字，I'm tired. 说的是状态；I'm 后面放什么，看对方问的是哪一个。"
+          }
+        ]
      }
    }
  ],
@@ -237,6 +237,16 @@
          "sentence": "What’s your phone number?",
          "meaning": "你的电话号码是多少？"
        }
+      },
+      "usage": {
+        "when": "你想记下对方的电话号码。",
+        "reply": "对方会回 My number is 123.",
+        "confuse": [
+          {
+            "id": "A0-P02",
+            "note": "What's your name? 问名字，这句问号码；都以 What's your 开头，听清后面的词再答。"
+          }
+        ]
      }
    },
    {
@@ -255,6 +265,16 @@
          "sentence": "My number is one-three-eight.",
          "meaning": "我的号码是一三八。"
        }
+      },
+      "usage": {
+        "when": "别人问你电话号码的时候，把号码报出来。",
+        "reply": "对方多半会复述一遍跟你确认。",
+        "confuse": [
+          {
+            "id": "A0-P01",
+            "note": "I'm Tom. 回答的是名字，My number is 123. 回答的是号码。"
+          }
+        ]
      }
    }
  ],
@@ -93,6 +93,16 @@
          "sentence": "What’s this?",
          "meaning": "这是什么？"
        }
+      },
+      "usage": {
+        "when": "指着身边一样东西，问它叫什么。",
+        "reply": "对方会回 It's a book.",
+        "confuse": [
+          {
+            "id": "A0-P02",
+            "note": "What's your name? 问的是人叫什么，What's this? 问的是东西是什么。"
+          }
+        ]
      }
    },
    {
@@ -118,6 +128,20 @@
          "sentence": "It’s a pen.",
          "meaning": "这是一支笔。"
        }
+      },
+      "usage": {
+        "when": "别人指着一样东西问你那是什么，你来回答。",
+        "reply": "对方可能接着问 How do you spell that?",
+        "confuse": [
+          {
+            "id": "A0-P09",
+            "note": "What's this? 是问，It's a book. 是答；别人指着东西问你，才用这句。"
+          },
+          {
+            "id": "A0-P13",
+            "note": "This is my mother. 是把人介绍给别人，It's a book. 是说这东西是什么。"
+          }
+        ]
      }
    }
  ],
@@ -21,6 +21,16 @@
          "sentence": "Where are you from?",
          "meaning": "你来自哪里？"
        }
+      },
+      "usage": {
+        "when": "想知道对方是哪里人。",
+        "reply": "对方会回 I'm from China.",
+        "confuse": [
+          {
+            "id": "A0-P02",
+            "note": "What's your name? 问名字，Where are you from? 问地方；Where 开头的一定是在问地点。"
+          }
+        ]
      }
    },
    {
@@ -43,6 +53,16 @@
          "sentence": "I’m from China.",
          "meaning": "我来自中国。"
        }
+      },
+      "usage": {
+        "when": "别人问 Where are you from? 的时候，说出你来自哪里。",
+        "reply": "对方常接一句 Nice to meet you.",
+        "confuse": [
+          {
+            "id": "A0-P01",
+            "note": "I'm Tom. 是名字，I'm from China. 是地方；from 后面跟的一定是地点。"
+          }
+        ]
      }
    }
  ],
@@ -93,6 +93,16 @@
          "sentence": "This is my sister.",
          "meaning": "这是我的姐妹。"
        }
+      },
+      "usage": {
+        "when": "把身边的家人介绍给别人。",
+        "reply": "对方会说 Nice to meet you.",
+        "confuse": [
+          {
+            "id": "A0-P01",
+            "note": "I'm Tom. 介绍的是你自己，This is my mother. 介绍的是别人。"
+          }
+        ]
      }
    }
  ],
@@ -147,6 +147,16 @@
          "sentence": "What day is it today?",
          "meaning": "今天星期几？"
        }
+      },
+      "usage": {
+        "when": "不确定今天星期几，问别人。",
+        "reply": "对方会回 It's Monday.",
+        "confuse": [
+          {
+            "id": "A0-P16",
+            "note": "What time is it? 问的是现在几点钟，What day is it today? 问的是今天星期几。"
+          }
+        ]
      }
    },
    {
@@ -173,6 +183,16 @@
          "sentence": "It’s Friday.",
          "meaning": "今天星期五。"
        }
+      },
+      "usage": {
+        "when": "别人问今天星期几的时候回答。",
+        "swap": "熟人之间也可以只说 Monday.",
+        "confuse": [
+          {
+            "id": "A0-P17",
+            "note": "It's Monday. 回答星期，It's three o'clock. 回答钟点；后面跟哪个，看别人问的是什么。"
+          }
+        ]
      }
    },
    {
@@ -190,6 +210,16 @@
          "sentence": "What time is it?",
          "meaning": "现在几点？"
        }
+      },
+      "usage": {
+        "when": "想知道现在几点钟。",
+        "reply": "对方会回 It's three o'clock.",
+        "confuse": [
+          {
+            "id": "A0-P14",
+            "note": "What day is it today? 问的是星期几，这句问的是几点钟。"
+          }
+        ]
      }
    },
    {
@@ -213,6 +243,15 @@
          "sentence": "It’s three o’clock.",
          "meaning": "现在三点。"
        }
+      },
+      "usage": {
+        "when": "别人问几点的时候，报出整点时间。",
+        "confuse": [
+          {
+            "id": "A0-P15",
+            "note": "It's Monday. 回答的是星期，It's three o'clock. 回答的是钟点。"
+          }
+        ]
      }
    }
  ],
@@ -130,6 +130,16 @@
          "sentence": "I like music.",
          "meaning": "我喜欢音乐。"
        }
+      },
+      "usage": {
+        "when": "说出你喜欢的一样东西。",
+        "reply": "对方可能反问一句 Do you like coffee?",
+        "confuse": [
+          {
+            "id": "A0-P19",
+            "note": "I like tea. 是在说自己，Do you like tea? 才是问对方；问对方要把 Do you 放在最前面。"
+          }
+        ]
      }
    },
    {
@@ -147,6 +157,16 @@
          "sentence": "Do you like coffee?",
          "meaning": "你喜欢咖啡吗？"
        }
+      },
+      "usage": {
+        "when": "想知道对方喜不喜欢某样东西。",
+        "reply": "对方会回 Yes. 或 No.",
+        "confuse": [
+          {
+            "id": "A0-P18",
+            "note": "Do you like tea? 是问对方，I like tea. 是说自己喜欢。"
+          }
+        ]
      }
    }
  ],
@@ -40,6 +40,16 @@
          "sentence": "Please say that again.",
          "meaning": "请再说一遍。"
        }
+      },
+      "usage": {
+        "when": "没听清对方说了什么，请他再说一次。",
+        "reply": "对方会把刚才的话重说一遍，通常会慢一点。",
+        "confuse": [
+          {
+            "id": "A0-P04",
+            "note": "How do you spell that? 是听清了但不会写，这句是根本没听清。"
+          }
+        ]
      }
    }
  ],