电离

The essay, which was published in Harper's, prompted a spray of derisive letters.

这篇刊载於哈泼杂志的文章，引来了一波波嘲讽的信件。

Y+ z; u+ C, K5 T+}$ S+}/ f X 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，因为轴的所有原子都会裂变。