The mortality wrought by an epidemic.
由一传染病引起的大批死亡
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。
Infant mortality (ie The rate at which babies die) was 20 deaths per thousand live births in 1986.
1986年的婴儿死亡率为生育成活率的千分之二十.
