when it is convenient;at one's convenience ;
We took the opportunity of visiting the palace.
我们趁便参观了皇宫.
I dropped in on him on my way home.
我在回来的路上趁便去他家看了看.
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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