open-door

例句：

1. 1. The teacher opened the door to let us in.
   老师打开了门让我们进去。
2. 2. The door is open, so you can come in now.
   门是开着的，你现在可以进来了。
3. 3. He opened the door to let his mother in.
   他打开门让妈妈进来。