The time required for the energy released by a radionuclide to decrease by half (i.e., the "half-life") range from tiny fractions of a second to millions of years depending on the type of atoms.

放射性核素释放的能量减半需要的时间范围是几分之一秒到几百万年，取决于原子的类型。

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Half of those emissions are caused by the time it takes to plan and build a nuclear power plant - time during which fossil fuels have to be burnt for energy.

其中一半的排放来自于核电站的规划和建造阶段，这个阶段它不得不依赖化石能源。

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The time required for the energy released by a radionuclide to decrease by half (i. e. , the "half-life") range from tiny fractions of a second to millions of years depending on the type of atoms.

放射性核素释放的能量减半需要的时间范围是几分之一秒到几百万年，取决于原子的类型。

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As a result of a variety of investments made under the Recovery Act, including state and local energy grants, we're on pace to upgrade the homes of half a million Americans by this time next year -- half a million Americans: boosting the economy, saving money and energy, creating clean energy jobs that can't be outsourced.

WHITEHOUSE: Retrofitting for Energy Efficiency and New Jobs