He grew up with an ever-present sense of mortality.他在成长的过程中经常感觉生命是有限的。

She has suddenly come face to face with her own mortality.她突然要面对自己的死亡。

the relationships between mortality and unemployment死亡率与失业率之间的关系

Their death and decay may deplete oxygen in the water, causing mass mortality of other living organisms.它们的死亡和腐败也许会大量消耗水中的氧气, 从而造成其他生物的大批死亡。