闸

例句：

1. 1. The bridge has a large gate at the entrance.
   这座桥有一个很大的入口门。
2. 2. The old man used to keep a small sluice in his garden.
   那位老人过去在他的花园里有个小水闸。
3. 3. The train stopped at the gate of the station.
   火车在车站的门口停了下来。