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The control rods are made of boron which absorbs neutrons .

控制棒是由能够吸收中子的硼元素制成。

A tritium atom has two extra neutrons .

氚原子多了两个中子。

The reactor 's role is to produce free neutrons through nuclear fission .

这个核反应堆是通过核裂变，制造自由的中子。

In the absence of free neutrons , this uranium is extremely stable .

在缺乏自由中子粒的情况下，这些铀极其稳定。

Quarks are the constituents of protons and neutrons , as well as more exotic things .

夸克是质子和中子的组成粒子，也是更为奇异的物质。