之前的研究表明这种基因变种让人类更容易演变成慢性阻塞性肺疾病，而当前的研究则对这种现象给出了一个解释。
Previous research showed that this gene variant makes humans more liable to develop chronic-obstructive disease (COPD), and the current study provides an explanation for this observation.
当人体经过遗传漂变的过程后，基因变种在人类中变得更常见。
New versions of a gene can also become universal in a population through a random process known as genetic drift.
兽医官员表示，该变种出现在越南和中国，对人类的威胁尚不可知。
The variant appeared in Vietnam and China and its risk to humans cannot be predicted, veterinary officials said.
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