相较而言，吸烟者得肺部感染以及死于肺结核的可能性大约是不吸烟者的两倍。
Smokers are about twice as likely to get the lung infection and die from it, compared with non-smokers.
假设是基于抽烟能削弱肺部功能或者免疫力，更可能是两者，从而使人们更容易受到疾病的攻击。
The presumption has been that smoking renders people vulnerable to disease by impairing lung function or immunity. And it may well do both.
这些基因位于人类14号染色体上，它们彼此相邻，科学家已知其中两个与胎儿期间肺部发育相关。
The three genes are located next to each other on human chromosome 14 and two are known to play key roles in fetal lung development.
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