1. His misconduct let in a host of troubles.
   他的不端行为招致不少麻烦。
2. I didn't know what I was letting myself in for.
   我不知道自己会卷入什么样的麻烦之中。
3. I hope you realize what you're letting yourself in for!
   我希望你意识到你给自己揽了多大的麻烦!
4. You must give the password before they’ll let you in.
   你必须给出口令，他们才会让你进去。
5. I fear for the city with this madman let loose in it.
   让这位精神病患者出来自由活动，我真为这座城市担心。
6. Father open the window to let in the briskness of the morning air.
   父亲打开窗户让早晨的清新空气进来。
7. A bowman can let off six aimed shots in a minute, an arquebusier only one in two or three minutes, when he has gone through all his manual exercise carefully.
   一名弓箭手可以每分钟瞄准射击六次，而一名火绳枪手只能每两三分钟射击一次，这还是在他严格按照程序操作的情况下!

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