Upstanding toothbrush makes use of a weight at the end of its rounded handle to create a centre of gravity at the handle base.
可站立式牙刷利用自身圆胖的手柄底端的重量来让重心点落在手柄底部。
Upstanding toothbrush makes use of a weight at the end of its rounded handle to create a centre of gravity at the handle base.
可站立式牙刷利用自身圆胖的手柄底端的重量来让重心点落在手柄底部。
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