锆锡合金形成第二道防护，把放射燃料跟反应堆其他的组成分隔开。
The Zircaloy casing is the second barrier to release that separates the radioactive fuel from the rest of the reactor.
我们的主要矿物燃料包括——煤，石油和汽油——他们的组成成分都包括碳，它已经在我们的地球积压了数百万年，我们现在将它使用和燃烧，让它快速的归还到大气中。
Our main fossil fuels — coal, petroleum and gasoline — are made up of carbon that has been compressed in the Earth for millions of years and we're now burning and rapidly restoring to the atmosphere.
乙烷一种无色无味的气态链烷，分子式为c2h6，是天然气的组成成分，可用作燃料或。
A colorless, odorless gaseous alkane, C2H6, that occurs as a constituent of natural gas and is used as a fuel and a refrigerant.
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