N-COUNT A thumbscrew is an object that was used in the past to torture people by crushing their thumbs. 拇指夹; 旧时刑具
N-COUNT If someone puts the thumbscrews on you, they start to put you under extreme pressure in order to force you to do something. 极大的压力
Attach brass valve arm to plastic valve arm with thumbscrew provided. Make sure serrations mesh properly.
用所提供的翼状螺丝将黄铜阀门臂附加到塑料阀门臂上。确保锯齿啮合适当。
One of a series of small ridges or grooves on the surface or edge of a metal object, such as a thumbscrew, to aid in gripping.
滚花：金属物体表面或边缘上的一系列小峰或凹槽，如指旋螺钉，使更容易握紧。
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