注意逗号在非限制性定语从句中的用法。
Pay attention to the use of commas in the Non-restrictive Attributive clause.
某些句子用了逗号为非限制性定语从句， 同没有用逗号的相比，意义有很大区别。
Compare the two sentences in the same group and find out the differences between them.
同样的，前者由非限制性定语从句构成。 但在科技文中，你需要将其转换成名词结构。
Use two commas, not one, to set off a nonrestrictive clause in the middle of a sentence.
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