英语导读句子
50 years ago, no one talked about acid rain.50年前，没人谈论酸雨。
Then we didn#39;t really know the harm it was causing to the world.那时，我们没有真正了解它对世界的危害。
Today almost every adult and school child is aware of acid rain and its effects.现在，几乎所有成年人和学生都认识到酸雨及其危害性。
It affects people all around the world.它对全世界的人都有影响。
Even those who are not responsible for its creation suffer from it.即使那些与其产生无关的人，也被其所累。
It is caused mostly by the burning of fossil fuels.它大都是由于燃烧化石燃料而致的.。
Fossil fuels are coal, gas, oil and peat and create carbon when they are burned.化石燃料指的是煤碳、天然气、石油，它们燃烧时会产生碳。
Carbon is both necessary and dangerous in our world.在我们这个世界上，碳既有用也有害。
Plants and trees need carbon dioxide, CO2, to breathe.植物和树木需要呼吸二氧化碳。
Carbon monoxide, CO, however, is poisonous to us.一氧化碳却对我们有害。
When carbon and other elements get into the air, they mix with water in the clouds.碳和其他的元素进入空气时，便与云层里的水分混合。
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