what do you mean by that中的by是什么词性,什么意思?

What do you mean by that?by what do you mean by saying what do you mean by 翻译 翻译 What do you mean by WTO What do you mean by this signal? what do you mean by doing sth? What do you mean by doing so? what do you mean by the word 为什么用by what do you mean what do you mean? what do you mean what do you mean. What do you mean what do you mean by/what's your meaning/what does..mean各造一个句子 what's the meaning of sth./what do you mean by sth./what dose sth mean. What does “encourage”mean?What do you mean by “encourage”?What's the meaning of “encourage”? What do you mean by doing that?同义句 what do you mean by 的几个同义句是好几个