He doesn't know why同义句两个空,

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Hedoesn''tknowwhy同义句两个空,Hedoesn''tknowwhy同义句两个空,Hedoesn''tknowwhy同义句两个空,Hedoesn''tknowthereason.why意思是为什

He doesn't know why同义句两个空,
He doesn't know why同义句
两个空,

He doesn't know why同义句两个空,
He doesn't know the reason.
why意思是为什么,用一个名词来表示,也就是原因.原因的英文表述是the reason.

He doesn't know the reason.
他不知道原因。
= He doesn't know why. 他不知道为什么。