以对话的形式练习有关不同食物的食用方法。

Practice how to order a meal by phone in pairs.

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事实上，18世纪后期欧洲人抵达之时，土著人还在练习掌握这种艺术形式，某些图像显示了他们之间的联系。

In fact, the Aborigines were still practising this art form in the late 18th century, when the Europeans began to arrive, and certain images point to the contact between them.

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当然，为了熟悉考试形式你也可以做一些测试练习。

Here again, of course, you can always try some practice tests to familiarise yourself with the format.

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So now that we have enough practice drawing Lewis structures let's talk about actually figuring out this formal charge.

那么现在我们已经做了足够多的画路易斯结构的练习,让我们来讨论一下如何得出形式电荷。

麻省理工公开课 - 化学原理课程节选