瓶盖的锁紧和松开装置设计合理，制做简单，成本低廉，便于推广应用。
The tool for closing and opening can bottle cap has advantages of reasonable design, simple manufacture, and low cost.
锁止装置可以使用适当的钥匙从锁止位置松开。
The locking device can be released from the locked position only by means of an appropriate key.
爆炸震击器被用来松开油管中的被卡的节流器或产量控制装置。
The explosive jar is used to loosen a stuck choke or production control in the tubing.
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