小测验：选择正确的单词

1. The parts lock into each other.
   各部分彼此连锁在一起。
2. We must keep the documents locked up.
   我们一定要把文件锁好。
3. The doors were kept permanently locked.
   这些门长期锁着。
4. In my haste I forgot to lock the door.
   匆忙中我忘了锁门。
5. A foolproof detonator;a foolproof safety lock.
   十分安全的炸弹;傻瓜也可打开的保险锁

　1个形容词解释