例句與造句

1. A one-way clapper valve permitted fresh water to leave at low tide.
2. The clapper valve often also has a spring that keeps the gate shut when there is no forward pressure.
3. Another variation of this mechanism is the "'clapper valve "', used in applications such firefighting and fire life safety systems.
4. The first US patent for an air purifying respirator was granted to Lewis P . Haslett in 1848 for his'Haslett's Lung Protector,'which filtered dust from the air using one-way clapper valves and a filter made of moistened wool or a similar porous substance.
5. It's difficult to find clapper valve in a sentence. 用clapper valve造句挺難的