People are arguing that the increase in lung caner was a consequence of cigarette smoking.
对肺癌患病率的增长是不是吸烟的结果人们仍在争论中.
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A clean border between the caner and healthy tissue can be difficult to find.
很难找到癌变的与健康组织间的明显界限.
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左半结肠癌伴梗阻行一期切除吻合术的体会右半结肠癌误诊为阑尾周围脓肿48例分析
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