The table folds up when not in use.

这桌子不用时可以折叠起来。

《牛津词典》

Folds up for easy storage.

折叠起来便于存放。

youdao

The screen folds up nice and neat when it is not in use .

屏幕折叠了漂亮整洁时，在不使用。

youdao

The panel folds up to reveal an illuminated storage bin with a USB port.

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P3 folds up for easy storage, and stows away into its own compact hard-shell carry case.

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The result would be several trajectories showing how the initial configuration of a protein determines the way it folds up.

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