brush back

基本解释

Move the tooth brush back and forth with short, vibrating stokes.
用短距离，振动的力量前后移动牙刷。
Lateral force can not brush back and forth otherwise they will damage gums.
不可横向来回用力刷，否则会损伤牙龈。
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.
关于毛笔的起源，在历史上的不同的说，在历史上记载最多的是蒙恬制做毛笔的故事，但近代的学者认为，早在蒙恬之前就有毛笔存在了。

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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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