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介词 OVER?The workers have to yell to be heard over the din of

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介词 OVER?
The workers have to yell to be heard over the din of the engines.这个句子中为什么要用介词over
介词 OVER?The workers have to yell to be heard over the din of
此处over 表“在...期间”"在...过程中”
如 My grandchildren will stay over Christmas.
我的孙儿孙女们圣诞节期间将呆在这儿.
The workers have to yell to be heard over the din of the engines
也就是“在嘈杂的引擎声间,工人们不得不大声喊叫才能听得见”