解释下这个英语what do you mean by saying that为什么这里是用by而不是用for啊,为什么不

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解释下这个英语
what do you mean by saying that为什么这里是用by而不是用for啊,为什么不可以用for,

y的一个基本意思是“以...为工具”,引申出的一个意思是“通过...方法做成某事”.
for的基本意思是“为了.”,还有一个意思是“就.来说,针对.情况来说.”
这句话可以机械地翻译为：“（通过）说那（句话）,”
显然句子中用by比较合句意.
如果用for,句子就解释不通了,成了“为了说那（句话）你的意思是什么?”
所以这里应该用by而不是for.
英语被称作“介词的语言”,原因就在这：介词用法复杂多样,需要增加阅读量,掌握更多例句才能形成语感.

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