Meanwhile, the deadliest strains of the virus perished with their hosts as natural selection favored strains that could infect hosts but not kill them.

同时，由于自然选择更倾向于选择那些能够感染宿主但不致其死亡的病毒，这种致命病毒便随着宿主的死亡而消失。

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What's the Deadliest Natural Phenomenon?

最致命的自然现象是什么？

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What is the deadliest disease in the world?

什么病是世界上最致命的疾病？

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Barbara Klein has more. Katrina was the costliest and one of the deadliest hurricanes to ever strike the United States.

VOA: special.2010.01.22

It was the deadliest day in the capital since American combat troops withdrew from Iraqi cities on June thirtieth.

VOA: special.2009.08.22

The deadliest American tornado on record is the Tri-State Tornado of March eighteenth, nineteen twenty-five.

VOA: special.2010.05.11

The deadliest tornado, which struck March 18, 1925, killed 695 people in Missouri, Illinois and Indiana.

NPR: Oklahoma Twister Tracked Path Of 1999 Tornado

April is the deadliest month for tornadoes, and the numerical frequency peaks in May.

FORBES: Global Warming Taking The Wind Out Of Tornadoes

Tuesday's recommendations were timed to coincide with the deadliest alcohol-related crash in U.S. history.

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