It has a built-in electric motor which can open or close the umbrella on demand.

它有一个可以根据需要开合雨伞的内置电动马达。

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At this time, the hand can conveniently open or close the door and the window.

此时，人手可方便的开启或关闭门、窗。

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At this time, the hand can conveniently open or close the door and the window.

此时，人手可方便的开启或关闭门、窗。

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