例句與造句

1. The main engines are equipped with exhaust gas economizers.
2. "It's just ridiculous, " said Bob Swift, 32, a stone mason from Antioch, Calif ., who sold two V8 vehicles and bought a Ford Ranger " in order to get a gas economizer ."
3. It's difficult to find gas economizer in a sentence. 用gas economizer造句挺難的