摘要
肺癌是危害人类生命的主要癌种之一，诱发肺癌的第一位因素是吸烟，第二位因素是吸入氡及其子体后的内照射．
Lung cancer is one of the main killers to mankind in all kinds of cancers.The first factor inducing lung cancer is cigarette smoking. The second factor is the internal exposures from the intake of Radon and its airborne decay products.
关键词
肺癌
吸烟
氡气
lung cancer
smoking
radon
