a water trough的用法和样例：
- After the mess gear which mustwash first puts in a water trough cleaning, then puts in another watertrough fast flushing.
- The Farras completed the 278-yard course, which includes a water trough and log hurdles, in 1 minute, 6 seconds in the critical heat and 1 minute, 4 seconds in the final.
- This is a watering trough uses Water drawn directly from a tap or faucet ,the body is manufactured by beaten aluminum, concision but not simple.
- A water power station must have a dam.
- Every apartment house has a water tank on its roof.