brush back

基本解釋

Move the tooth brush back and forth with short, vibrating stokes.
用短距離，振動的力量前後移動牙刷。
Lateral force can not brush back and forth otherwise they will damage gums.
不可橫曏來廻用力刷，否則會損傷牙齦。
Brush on the origin of different in history, said the most recorded in history is the story of Penpower brush making, but modern scholars believe that there is a brush back in Penpower existed before.
關(guān)於毛筆的起源，在歷史上的不同的說，在歷史上記載最多的是矇恬制做毛筆的故事，但近代的學者認爲，早在矇恬之前就有毛筆存在了。

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Place the brush at the back of the nail (slightly away from the cuticle) and ease it lightly toward the cuticle line, then float the brush down the nail toward the tip.
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