動詞 let in:

1. allow participation in or the right to be part of; permit to exercise the rights, functions, and responsibilities of
   同義詞：admit, include
2. allow to enter; grant entry to
   同義詞：admit, allow in, intromit

1. The roof let in the rain.
   屋頂漏雨。
2. The interstices between the bricks let in cold air.
   冷空氣透過磚縫進入室內。
3. Open the window and let in some fresh air.
   打開窗戶，讓新鮮的空氣進來。
4. Are you going to let them in on the plans?
   你是否打算讓他們知道這些計劃？
5. This skirt needs letting in at the waist.
   這裙子的腰部需要改瘦。
6. You're letting yourself in for trouble by buying that rusty old car.
   你買那輛生了　的舊汽車是自找麻煩。