看来俺十几年在外企摸爬滚打的土语感也不是很渣嘛,特地去查了下Rate的英文释义
A quantity measured with respect to another measured quantity:
A measure of a part with respect to a whole; a proportion:
The cost per unit of a commodity or service:
A charge or payment calculated in relation to a particular sum or quantity:
Level of quality.
其中第二个a measure of a part with respect to a whole, a proportion, 不就是比率吗?