One in five lung cancer sufferers have a particularly virulent strain called small cell lung cancer which kills all but three per cent of sufferers within five years of diagnoses.

1/5的癌症患者带有一种特别的有毒病株，称为小细胞肺癌，这种肺癌五年内杀死了近3%的确诊患者。

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The authors argue the version of the disease that caused the medieval plague is likely extinct, but suggest that further study could reveal how it may have evolved into a less virulent strain.

作者们称引起中世纪瘟疫的品种可能已经灭绝了，但是他们认为进一步的研究可以揭示它是如何进化到一种没那么致命的类型。

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Studies have detected no signs that the virus has mutated to a more virulent or lethal form.

经研究未发现迹象说明病毒已突变为更具毒性或更致命的形式。

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In the Sabin vaccine, or the oral polio vaccine, now you have a non-virulent virus.

在沙宾疫苗,即口服小儿麻痹症疫苗中,存在非致病性病毒

耶鲁公开课 - 生物医学工程探索课程节选

According to this argument, it has been America's lack of consistency in its relations with allies and foes alike, and its sporadic attention to places such as the Middle East, that have allowed virulent anti-Americanism to fester.

ECONOMIST: America's place in the world

Such thoughts may have been fuelled by a virulent recent press campaign in France against Mr Strauss-Kahn's wealthy lifestyle, with details of his and his wife's swanky properties in Marrakech, Paris and Washington.

ECONOMIST: Dominique Strauss-Kahn

In early tests researchers have stopped the growth of the most virulent human tumors, varieties accounting for 25% of cancer deaths.

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