我们都知道大多数汽车、摩托车、船只和飞机会造成空气污染。
We all know that most cars, motorcycles, boats and planes cause air pollution.
从历史上看，大多数汽车都以汽油为燃料，但这种情况在未来可能会改变：汽车也可以使用其他液体燃料和电力。
Historically, most cars have run on gasoline, but that may change in the future: cars can also run on other liquid fuels and electricity.
这是因为大多数汽车制造商将他们的汽车出口到世界各地。
This is because most automakers export their cars all over the world.
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