he has to brush up on some of the new ideas
问题描述:
he has to brush up on some of the new ideas
这句话可以去掉 of the
变成:he has to brush up on some new ideas.
如果可以,有什么不同,如果不可以,为什么
答
some of the new ideas,是指这些主意or想法中的一些
some new ideas 一些想法
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