例句與造句

1. The artificial oil shortage that began on Oct . 18, 1973, led to six months of agonizing and improvising by government officials and drivers desperate to find a service station that still had gas.
2. As the price of whale oil escalated, scientists tried to create a cheap, artificial oil that would burn with a bright, smokeless flame, safer than  burning oil .  Two succeeded : Scottish chemist James Young, and Canadian geologist Abraham Gesner.
3. It's difficult to find artificial oil in a sentence. 用artificial oil造句挺難的