调速比的英文：
speed ratio

speed是什么意思：
n. 速度，速率；快速，迅速
v. 迅速前进，快行；促进；加速，使加速

The speed of a train differs greatly from the speed of an airplane
火车的速度与飞机的速度大不相同。

The car is gaining speed.
那辆轿车正在加速。

The worker is timing the speed of the machine.
这名工人正在调整机器的速度。

a dizzy height, speed
使人眩晕的高度、 速度.

Speed the parting guest
祝客人一路顺风

ratio是什么意思：
n. 比率；比例

neutralization ratio
中和比率|中和比例

This is the prime ratio of the nascent increments
这是最初增量的最初比。

Asset quality ratios: Ratios that measure the quality of assets of a lending institution.
资产质量比率:衡量贷款机构资产质量的各种比率。

Gearing ratio [IFC]: Ratio of outstanding investments and guarantees to the capital base.
资本搭配比率[国际金融公司]:指投资和担保余额与基础资本之间的比率。

This value has been called the canonical ratio.
这个数值称为“正则比值”。