By the way, I would like to ask you that.....顺便说一下,我想问你....
By the way, would you please tell me.....?顺便说一下,你能告诉我.....么?
By the way, I want to know.....顺便说一下,我想知道....
或者你也可以直接点,By the way, 后面直接加你想知道的事情,比如说
By the way, may I have your telephone number?
顺便说一下,你可以给我你的电话号码么?
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