1. Loosen clothing around the neck to facilitate breathing. 解开围在脖子上的衣服以促进呼吸。
2. Loosen the valve union nuts and slide them back over the end connections. 松开阀门的管接头螺母，并将其滑回到端口连接件上。
3. To clean or replace parts; shut off supply, loosen lock-nut and back off adjusting screw. 如果要清洗或更换部件，关闭供应管道，松开锁紧螺母，退出调节螺丝。
英英解释
v.
1. make loose or looser
2. make less severe or strict
3. become less severe or strict
4. disentangle and raise the fibers of
5. cause to become loose
6. make less dense
7. become loose or looser or less tight
