in passing 

/?pɑ?.s??/

If something is said in passing, it is said while talking about something else and is not the main subject of a conversation.

順便，附帶地

When asked if he had told the police about the incident, Mr Banks said he had mentioned it in passing to a detective. 

被問及是否已將此告訴了警察時，班克斯先生說他曾向一位偵探順便提過。

The army is only mentioned in passing.

軍隊只是順便被談及。

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