when it is convenient;at one's convenience ;
I dropped in on him on my way home.
我在回来的路上趁便去他家看了看.
We took the opportunity of visiting the palace.
我们趁便参观了皇宫.
Don't forget to pick up the ice cream on your way home.
别忘了在回家的路上趁便买冰淇淋.
When you go back, would you take a message for me?
你回去的时候, 趁便给我带个口信.
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