incidentally (used to introduce a minor topic not connected with what was being spoken about previously)
顺便说说,顺便提起
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oh, by the way, while you were away I had a message .哦,顺便提一句,你不在的时候我收到了一条消息。
during the course of a journey
在路上,在途中
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you will have a fine view of Moray Firth by the way .在途中你将欣赏到马里湾的美丽景色。