at sb.'s convenience;while you're at it ;

Eggs are cheap when they are plentiful and they are dear when they are scarce.
鸡蛋多了就便宜,少了就贵.
来源:《用法词典》Absolutely, said Teddy. It was already cheap, and now its fumigated.
当然, 泰迪答道. 本来它就便宜, 何况他又被烟熏过了.
来源:互联网摘选It is a flash in the pan, when a successful man never thinks about keeping ahead of the times.
一个人再成功而不思进取,走在时代的前头,那边他的成就便好久不长。
来源:互联网摘选从前,有一个人眼睛虽然瞎了,可是他精于嗅觉,只要用手摸一摸,凭借着触感就便能说出这是什么动物。
来源:互联网摘选
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