18.to come loose松动；脱落
A page came loose and floated onto the tiles.有一页纸脱落下来, 飘落到地砖上。
Two wooden beams had come loose from the ceiling.房顶上有两根木梁已经松动。
19.to let sb loose
+ prisoner释放某人
Why didn't you tell me she'd been let loose?你为什么不告诉我她已经被释放了？
20.to set sth loose
+ animal让…自由活动
They imported a number of English red foxes and set them loose along the banks of the Chesapeake.他们进口了一些英国红狐, 在切萨皮克湾两岸将它们放生。