Many children are latchkey kids. Accidents are frequent; we heard of an elementary school student who badly burned himself in a science experiment, with his older brother watching.
2
我们把它装在前门旁边用来挂钥匙。
It's mounted next to our front door and holds house keys.
3
如果你够幸运的话,你有可能在餐厅大厅的墙上发现挂著的黄钥匙。不过上校,现在可不是什么幸运时间。
If you were lucky you might find a brass key hanging on a wall in the Mess Hall. But these are not lucky times, Capitaine.