spigot of the classifier

例句：

1. 1. The spigot on the faucet is loose.
   水龙头上的旋钮松动了。
2. 2. The valve is closed tightly.
   阀门紧闭。
3. 3. The screw holding the lid in place was lost.
   固定盖子的螺丝丢了。