How to say "by the way" in Chinese?
ex: By the way, what's this?

Question

Answer

順便問一下， 這是什麼?
順便一問， 這是什麼?

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by the way=顺便, But in  our daily life,we won't use the phrase frequently.It's common to say the words"对了，......."to start a new topic.

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by the way=顺便,  
by the way , i want to tell you:"....."     我想顺便告诉你一下。。。。
i will give this to him by the way,       我可以顺便把这个给他

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1,對了! would you go with me? 2.順便一提 ,would you go with me?.3.我突然想到, would you go with me? 4.阿! would you go with me? 5.
By the way , would you go with me?

Answer

英文課本寫:順帶一提
不過口語是不會這樣說

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