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1.
I just don't know what to say.
我真的不知道该说什么好。
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2.
I just don't know what to say.
我就是不知道说什么。
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3.
Sure we're concerned about that just like everybody else, but I don't know what to say except 'Yeah, that sounds scary as hell.
当然我们关心的只是像其他人一样,但我不知道该说些什么,除了‘是啊,听起来可怕的地狱。