单词uranium 235
网络: 铀二三五
Because uranium-235 is quite rare, making up less than 1% of natural uranium, it has to be enriched until the fuel contains 2-3%.
由于铀235很稀有，只占天然铀中的不足1%，所以必须提高浓度，让燃料中有2~3%的含量。
To make an atomic bomb we have to use uranium 235, in which all the atoms are available for fission.
制造原子弹，我们必须用铀235，因为铀的所有原子都会裂变。
To make an atom bomb we have to use uranium 235, in which all the atoms are available FOR fission.
制造原子弹必须用铀235，因为它的所有原子都可以裂变。
To make fuel for electricity-generating reactors, uranium is enriched to less than 5 percent of the isotope U-235.
为将燃料做成电能反应堆，铀被浓缩至U-235同位素含量5%以下。
And the energy density of uranium 235 in terms of thousand times the energy density of coal.
铀235的能量密度，能量密度乘以煤的。
a uranium isotope with mass number 235; capable of sustaining chain reactions.
铀的同位素，原子质量数为，能进行持续的连锁反应。
Nuclear power stations use nuclear fission to generate energy by the reaction of uranium-235 inside a nuclear reactor.
核电站通过核反应堆里铀-235的反应，发生核裂变从而产生能量。
So you put in more fuel, more uranium 235, a higher enrichment and you need to balance that excess reactivity in a number of ways.
所以你放入更多的燃料，更多的铀，一个能咖的浓缩度，你需要平衡，剩余反应性，用很多方法。
Current light water reactors make relatively inefficient use of nuclear fuel, fissioning only the very rare uranium-235 isotope.
目前的轻水反应堆对核燃料的使用相对低效。只能裂变出非常少的铀235同位素。
An atomic bomb uses conventional explosives to slam together two lumps of fissionable material, usually uranium-235 or plutonium-239.
原子弹利用常规爆炸让铀235和钚239这两块分裂性原料相互撞击。