You can always bargain here, but goods tend to come and go quickly so if you like it, buy it now!

你可以总在这里讨价还价，但是商品似乎来去得快，所以如果你喜欢，现在就买！

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Modern fashions come and go quickly.

现代时装变化很快。

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In other words, this expression has been around a long time. It's not one of those slang expressions that come and go quickly with some passing fad.

换句话说，这种表达方式由来已久，并不是什么昙花一现的流行俗语。

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Marketing budgets are frequently spent on episodic activities like events, e-mail campaigns, webinars and other activities that come and go quickly and leave no lasting footprint.

FORBES: Magazine Article

Sluggers come and go quickly in the majors.

FORBES: Atlanta Braves Catcher Evan Gattis Is The Best Story In Baseball's Early Season

Most food trends come and go as quickly as the pop-up spaces that host them.

BBC: London��s last word in Peruvian food