下线的英文：
under line

Loosen setscrew 2, and remove thread tention as m 5.
拧松固定螺丝2，卸下线张力(组件)5。

Under the hammer
被拍卖

under the ground;swam under water.
在地下；游到水下

Under water, famine; under snow, bread.
洪水造饥馑，瑞雪兆丰年

The coin rolled under the bed.
硬币滚到床底下去了。

You are under the scrutiny of the police
你现在受到警察的监视。