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请辨析一下assist/help和declare/announce

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请辨析一下assist/help和declare/announce
请辨析一下assist/help和declare/announce
assist是协助.
A team of nurses assisted the doctor in performing the operation.
一组护士协助医生施行手术.
做手术的还是医生.护士只是协助医生工作.
help是帮助.
Could you help me up with this suitcase?
你帮我把这箱子搬到楼上好吗?
帮忙你就直接帮人帮到底好了~
辨析announce, declare
announce 和declare 语义相近,但结构有区别.
announce 后接名词或代词或that宾语从句,而declare除接上面结构以外还可接复合宾语等结构.
declare在语义上还有些特殊的用法.试比较下列句型.
Soon Germany declared war on France.
不久德国对法宣战.(不用 announce)
The bell announced the end of the class.
下课铃响了.(非正式,不用declare)
The committee announced/declared the results of the experiment.
委员会宣布了实验的结果.