n.死亡率；死亡数目；必死性
Infant mortality is still very high in some developing countries. 某些发展中国家的婴儿死亡率仍然很高。
If this disease spreads, the doctors fear that there'll be a high mortality. 如果这种病传播开来，医生们担心死亡率将会很高。
The mortality from lung cancer is increasing. 肺癌死亡人数在增多。
n.不朽；永生
