名词
中文翻译：螺纹的顶端
同义词：
['top of a screw', 'top of a bolt', 'top of a screwdriver']
例句：
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1. The engineer carefully measured the length of the screw before tightening it.
工程师仔细测量了螺丝的长度，然后拧紧。
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2.He used a screwdriver to remove the crest of the screw from the wall.
他用螺丝刀从墙上卸下了螺丝的顶端。
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3.The carpenter used a chisel to smooth the crest of the screw into a flat surface.
木匠用凿子将螺丝的顶端打磨成一个平面。