If law and order in not preserved为什么是"is"?

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/07/13 07:45:46

If law and order in not preserved为什么是"is"?
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有笔误吧?应该是If law and order is not preserved,对吧?这里的law and order（还可用regulation)是指“法律法规/制度”,虽然是用and的两个词,但要表达是一个概念,是作为一个整体理解的,所以用is.
比如：Knife and fork is popular at table in western countries.在西方国家餐桌文化中刀叉是非常常见的.

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