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传统的螺纹加工方法有：手工攻丝、钻床攻丝、振动攻丝等。
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the medical orthopaedics left-hand tap solves the tapping problem of the left-hand screw.
本实用新型解决了左旋螺丝钉的攻丝问题。
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"quit that," he muttered, tapping the boy's knee with a light touch of his hand.
“别这样了，”他小声说道，用手轻轻一碰拍了拍男孩的膝盖。
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