由放射性钠衰变产生正电子，冷却后形成一个由大约100万个正电子组成的体积同样大小的粒子云团，这团正电子被存放在相邻的一个容器中。
The positrons, produced by the decay of radioactive sodium, are cooled into a similarly sized cloud of around 1m particles and held in a neighbouring trap.
这是因为放射性核素在这巨大的爆炸能量中形成，其中一些放射出正电子而衰变。
This is because radioactive nuclear elements are formed in the giant outbursts of energy, and some of these decay by releasing positrons.
这是因为放射性核素在这巨大的爆炸能量中形成，其中一些放射出正电子而衰变。
This is because radioactive nuclear elements are formed in the giant outbursts of energy, and some of these decay by releasing positrons.
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