The mortality in a particular place or situation is the number of people who die. 死亡人数
noun [具体名词] 死亡人数，死亡率；必死性，终有一死；死亡
Premature birth is the main cause of perinatal mortality. 早产是围产期死亡的主要原因。
Premature birth is the main cause of perinatal mortality. 早产是围产期死亡的主要原因。
