肺癌症状

lung cancers───[肿瘤]肺癌

lung cancer───[肿瘤]肺癌

typical symptom───典型症状

withdrawal symptoms───脱瘾症状；断除症状

Lung cancer can also exist for years, hardly creating symptoms until its most virulent stage.───肺癌还可以几乎毫无症状的存在多年，直到晚期才被发现。

most cases, lung cancer is not suspected until it causes symptoms like a chronic cough or wheezing.───大多数情况下，直到出现长期的咳嗽或气喘这些明显的症状时，才会考虑肺癌。

Participants had either a current or former cigarette smoking history of at least 30 pack-years, and had to be without symptoms or a history of lung cancer.───参与者都是现行吸烟者或至少有过30包年吸烟史的人，而且尚未出现肺癌征兆也没有肺癌历史。