Prof Logan observed: "We use hydrogen for many, many things." It is used in making [petrol], it is used in foods etc.
洛根教授说:“我们在很多方面都使用氢气,比如制备汽油、食品等行业。”
Have you used your ration of petrol for this week?
你用了这星期给你定量的汽油了吗?
Because it is not heavy for the power it gives, a petrol engine is still used in small aircraft.
就功率来说,汽油发动机不算重,因此,现在的小型飞机仍然使用它。
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