净重：总重扣除皮重后的重量。

Net weight: the gross weight less tare.

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面摩：突然的重扣，球打在对方的脸上（俚语）。

End line: A boom or spike that hits an opponent in the face (slang).

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本发明的有益效果在于：采用插头与插孔和活动扣的双重扣紧结构，安全性高，结构简单，不易丢失。

The invention has the advantages of a double locking structure by use of the plug, the jack and the movable button, high safety and simple structure and is not easy to be lost.

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