癌症的一个定义特征是快速产生异常细胞，这些细胞超越其通常边界生长并可侵袭身体的毗邻部位和扩散到其它器官。
One defining feature of cancer is the rapid creation of abnormal cells that grow beyond their usual boundaries, and which can then invade adjoining parts of the body and spread to other organs.
中国核安全机构说，他们没有发现任何异常辐射，但中国国内越来越担心，辐射云可能借助风力向东扩散500英里到达中国。
China's nuclear safety agency says it has detected no abnormal radiation, but fears are growing in the country that winds could send radiation clouds 500 miles east to China.
患者一旦染上一种称之为年龄相关性黄斑变性(湿型amd)的疾病，其血管就会出现异常且会扩散到视网膜的中心，损害患者的中心视觉。
The disease is wet age-related macular degeneration (wet AMD), in which blood vessels grow abnormally and leak into the centre of the retina, damaging sufferers' central vision.
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