The plug-up of the crude oil gathering line due to wax condensation is a common trouble occurring in the oil field.

油田集油和输油管线冻（凝）堵是油田生产常见故障之一。

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Make sure the plug is wired up correctly.

插头一定要接对。

《牛津词典》

It's up to you to plug the leak—even though there are always a dozen reasons to stay stuck in your dull routines of life.

这取决于你是否能填补这个漏洞——尽管总有一堆的理由把你困在枯燥的每日常规工作中。

youdao

And we plug in our values and end up with mv squared mv^2/r-Ze^2/ over r minus Ze squared over And I am going to call this equation two.

我们最后的结果,就是,我把这称为方程式二。

麻省理工公开课 - 固态化学导论课程节选

That said, I was sold on the idea pretty quickly, so signed-up and then downloaded the plug-in.

BBC: Me.Dium.com

Electric cars can also only go 70 to 100 miles on a single charge before the driver has to plug-in and power up again.

BBC: Rental cars go electric

That means when you click from an insecure tab in your browser to a secure one, the insecure site can wait until the user is on a trusted site and send a pop-up requesting the user download a plug-in.

FORBES: Twenty-Four More Reasons Not To Trust Your Browser's "Padlock"