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。

youdao

Excavation and trace element analysis indicates: Jehol biota experienced mass mortality and rapid burial; toxic gases of the volcanic activities are the main factors of biological catastrophic event.

化石发掘和微量元素分析表明，热河生物群经历了集群死亡和快速掩埋，火山活动的有毒气体是生物灾难事件的主要因素。

youdao

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