The fission reactions that happen are all about proximity. In a fuel rod, lots of uranium atoms can crash into each other as they break apart. Pack the fuel rod into an assembly, and lots more atoms can affect one another—which means the reactions can release more energy. Put several fuel assemblies into the core of a nuclear reactor, and the amount of energy released gets even higher.
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Styled to look like a hot rod of the past and to sip fuel like a car from the future, Louisiana Tech University's Roadster took home one of two grand prizes in the Shell Eco-marathon Americas.
看起来像一部改装的高速跑车而却极其省油，路易斯安那科技大学的这款跑车获得了壳牌美洲环保马拉松大赛两项大奖之一。
Indeed, ninety-five percent of a spent nuclear fuel rod is natural uranium, and so it can be put right back in the ground, just as it was found.
实际上，一个用尽的核燃料棒中95%的是天然铀，因此我们可以把它重新埋入地下，就像刚发现那样。
In exchange, the operators of Germany's 17 nuclear plants will pay a combined 2.3 billion euros in annual fuel-rod taxes and contribute to a renewable-energy fund.
作为交换，德国境内17座核电站的运营商需要每年为年度燃料棒税和再生能源基金支付总额为23亿欧元的费用。
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