in passing

/ˈpɑː.sɪŋ/

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

顺便，附带地

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

被问及是否已将此告诉了警察时，班克斯先生说他曾向一位侦探顺便提过。

The army is only mentioned in passing.

军队只是顺便被谈及。