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Illustration of a difficult idea is often effective in lectures.

讲课时用图表来说明某个难懂的概念往往是行之有效的。

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Read about the topics before I discuss them in lectures.

在我们讨论某个主题前请先阅读它。

youdao

Read about the topics before I discuss them in lectures.

在我们讨论某个主题前请先阅读它。

youdao