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。
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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