The threat of mass mortality often never materialises.

大规模死亡的威胁从没突然出现。

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And the inconvenience of an information breakdown, even if it were a great calamity, would not involve mass mortality - at least not for a while.

信息系统崩溃的不便，虽然是场大灾难，但不会造成大面积的伤亡，——至少现在还没有发生。

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In 2007, mass mortality of bees occurred across America in 20 states, which posed a severe threat to America's agriculture that relies heavily on pollination by bees.

2007年，美国20个州出现蜜蜂大面积死亡，对以蜜蜂授粉为主的美国农业造成严重威胁。

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Peto and his colleagues in the Prospective Studies Collaboration, a team of dozens of researchers from around the world, say they did the new study to figure out exactly how body mass index (BMI) relates to mortality.

CNN: Obesity can shorten lifespan up to a decade