Now the bases, and you don't need to memorize the structures of these I'm going - I'm describing the whole molecule to you in its molecular detail and then we're going to simplify it down to a version that we can talk about more easily.

现在讲碱基,你不需要记住这些结构,我将给你们详述整个分子,的结构细节,然后我们把它简化为一个模板,使我们更容易讨论

耶鲁公开课 - 生物医学工程探索课程节选

I tried calling you all week.

我一整个星期都在给你打电话。

I'm worried 实战 - SpeakingMax英语口语达人