把人们的年龄因素考虑在内之后，研究者发现身体最为健康的人群中，所有类型的白血球都是最低的。
After taking account of age, the researchers found that all groups of white blood cell were lowest in the men who were most physically fit.
研究包括验血，分析血液中所包含的各种类型的白血球。
Blood tests were taken, and analysed for their content of various types of white blood cell.
斯坦福大学的研究者们提出的这项假设发人深思，甚至出人意料。 他们所说的基因控制了一种被称为自然杀手细胞(NK细胞）的白血球细胞。
The genes in question control a type of white blood cell known as natural killer cells, or NK cells.
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