lesson_flow.dart 保留流程状态、公共脚手架与小组件,预习/听/说/读/写/独立表达 六个步骤各自成为 part 文件。代码仅搬移并经 dart format 格式化,无用户可见变化。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
kouyu_english
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