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。
The open-phase protection in long-distance motor operation is very important in practice.
电动机远距离运行断相保护在实际工作中很重要。
The open-phase protection in long-distance motor operation is very important in practice.
电动机远距离运行断相保护在实际工作中很重要。
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