When the star exhausts its usable fuel, it abruptly loses the constant struggle to hold up its own weight.
当恒星耗尽了可使用的燃料时，它会突然失去用以支撑它本身重量的惯有力量。
But it requires energy to separate the algae from the water and then process the oil they make internally into a usable fuel.
但是这需要能量将藻类从水中分离出来，然后加工成可用燃料。
India is short of usable uranium. If it could buy foreign fuel for its civilian reactors, it could devote more of the stuff it makes at home to bomb-building.
印度没有可用的铀，如果他可以从国外购买到民用反应堆使用的燃料，那么就可以在家里直接把制造出来东西投入到核弹中。
India has since designated some of its reactors as civilian, and open to inspection, but others still churn out spent fuel richly laden with weapons-usable plutonium.
印度自那时便将其一些反应堆标明为民用，而且愿意接受检查，但其他的反应堆仍大量炮制燃烧过的富含用于武器制造的钚的燃料。
Figuring out how to put the fuel into a usable weapon will also take time perhaps a year or more.
掌握把燃料装进可使用的武器的方法也需一年或更久的时间。
The internal-combustion engine is a device used to convert the chemical energy ofthe fuel into heat energy, and then to convert this heat energy into usable mechanicalenergy.
译：内燃机是用于将燃料的化学能转化为热能，再将热能转化为可用机械能的装置。
The invention provides an emulsion fuel usable as the fuel to be combusted in internal combustion engines under proper combustion conditions.
一种作为在合适的燃烧条件下使内燃机燃烧的燃料来使用的乳化燃料。
The invention provides an emulsion fuel usable as the fuel to be combusted in internal combustion engines under proper combustion conditions.
一种作为在合适的燃烧条件下使内燃机燃烧的燃料来使用的乳化燃料。
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