物理实验是物理教学的关键之一。

Physical experiment is one of physics teaching's key.

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网络课件是网络教学的关键。

Web-based courseware is the key of network teaching.

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参与意识培养是学生主体参与教学的关键；

Third, Fostering participation awareness is critical for students' subject participation.

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The crucial point about the syllabus is that it indicates what reading you need to have done for any given week.

教学大纲的关键点,是指出了什么样的读物,你需要在给出的时间内完成。

耶鲁公开课 - 死亡课程节选