We must recall that this reaction involves not just the encounter of two molecules and constituent atoms . 我们必须强调指出，该反应不只是两个分子碰撞和组成原子的碰撞。
By that is meant the time which elapses before half of the existing atoms have disintegrated or exploded . 这里所指的半衰期是现存原子的一半发生衰变或爆炸所消耗的时间。
When a molecule contains two or more atoms of the same kind, a subscript indicates the number present . 当某一分子包含两个或多个同种原子时，就用一个角标表示该原子的数目。
A high-energy electron which penetrates into the metal atom may dislodge one of the inner electrons of that atom . 一个穿入金属原子的高能电子可以逐出该金属原子的一个内层电子。
In fact, it turns out that some of the relativistic wave functions for the hydrogen atom are infinite at the origin . 事实上，实际情况是氢原子的某些相对论波函数在原点是无限的。
The internal structure of the atom was the rock upon which the glorious ship of classical theory was doomed to be wrecked . 原子的内部结构是注定要把经典理论这条光荣航船撞碎的礁石。
A material is completely characterized when the identity and position of all of its constituent atoms are known . 如对某种材料的组成原子的等同性与位置都了解了，那么，该材料的品质就完全鉴定了。
