Morbidity or mortality is typically the result of tumor bulk and mass effect on adjacent organ systems.

发病率或死亡率通常是肿瘤体积和质量对邻近器官系统作用来决定的。

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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。

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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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