gate turn valve

例句：

1. 1. The gatekeeper opened the gatefor us.
   看门人为我们打开了大门。
2. 2.The gates of hell are never closed.
   地狱的门永远敞开。
3. 3. The gates ofthe palace were guarded by fierce guards.
   宫殿的大门由凶猛的守卫看守。