pop up

动词

中文：弹出

To come up with a "pop" sound. (intransitive) · The toast is in the toaster - when it pops up it will be ready.
To appear without warning. (informal, intransitive) · I can't remember where I left my keys, but they normally pop up somewhere.
(Of an alert, advertisement, etc.) To suddenly appear onscreen. (intransitive) · And then up popped on my screen something truly bizarre.
To display as an alert, advertisement, etc. that suddenly appears on screen. (transitive) · My computer just popped up a warning about Internet security.

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