unscrew
v
(a) [Tn] loosen (a screw, nut, etc) by turning it; unfasten (sth) by removing screws 旋松(螺丝、 螺母等); 旋下螺丝以松开(某物)
unscrew the door-handle 松开门拉手上的螺丝.
(b) [I, Tn] (make sth) come undone by twisting (将某物)拧开
The lid of this jam pot won't unscrew. 这果酱罐的盖子拧不开.
How will we know whether it can have a positive effect on the company?
我们怎么会知道它对公司能有积极的效果呢?
Shortly after this the famous H. M. S. Challenger expedition established the study of the sea-floor as a subject worthy of the most qualified physicists and geologists.