A water molecule is made from two very light atoms, hydrogen and oxygen.

水分子由两种非常轻的原子组成，氢和氧。

It involves smashing light atoms together, so they fuse, and harnessing the energy this releases.

原理是让轻原子相撞后融合在一起，然后利用融合释放的能量。

This is a fusion bomb, i.e. it reproduces the reaction occurring in stars by fusing two light atoms, deuterium and tritium, under high pressure and a temperature of several million degrees Celsius.

这是一颗聚变炸弹，即在高压和几百万摄氏度的温度下，通过聚变两个轻原子氘和氚来重现恒星中发生的反应。