水龙头用应用怎么说

hydrant
tap

这两个都可以

水龙头:
tap
water faucet

1. 管子工连接上所有管子，然后打开了水龙头。
The plumber connected up all the pipes and turned on the tap.

2. 他用自来水龙头流出的凉水把手洗干净。
He cleaned his hands in the cold water from the tap.

3. 水正从水龙头流出。
Water was falling from the faucet.