Come again:used to ask somebody to repeat something (要求重复)再说一遍,你说什么来着
听不清别人的话,想让他再说一遍,我们通常可以说"Pardon?(注意一定是声调)","Would you repeat it?"等等.
Come again 也可以用来表示这个意思:
Come again? I didn't quite understand what you said.
你说什么?你刚说的话我不明白.
She's an entomologist.'
'Come again?'
'An entomologist─she studies insects.'
"她是昆虫学家."
"请再说一遍?"
"昆虫学家 她是研究昆虫的."
Come again 还有质疑别人说的话的意思,想想看,当你质疑别人的话时,是不是也常说"你说什么"?