常用词语和句型：
proportion 比例
proportional 比例的，成比例的
proportionally 成比例地，按比例
proportionate 成比例的，相称的
proportionately 成比例地
disproportionately 不成比例地
ratio 比，比率
in a / the proportion of ... 与…成正比
(be) in a / the ratio of ... to ... 是…与…之比
in the proportions of ... to ... 按…比…的比例
(be) proportional to ... 与…成正比
(be)out of proportion to ... 与…不成比例
the + 比较级 , the + 比较级 越…，越…
A proportion of one part by volume of acid to three parts by volume of water should be used．
应使用按体积 1 份酸 3 份水的比例。
Hydrogen and oxygen are present in water in the proportions of 1 to 8 by weight．
氢和氧按重量 1 比 8 的比例存在于水中。
The areas of triangles standing on the same base are proportional to their heights．
同一底边的三角形的面积与它们的高度成正比。
The pronts of the enterprise will be divided proportionally among the participants on the basis of
the work each one does．
这一事业的利润将根据每个参加者所做的工作按比例分配。
As the demand for power increases , the supply is proportionately increased．
随着对电力需求的增长，供电量也成比例地增长。
Compared with the human adult , the new-born human baby has a disproportionateJy large head．
与成年人相比，新生婴儿的头大得不成比例。
An elephant's tail seems out of proportion , to the rest of its body．
大象的尾巴似乎与其身体的其余部分不成比例。
There are l5 parts of air to every part of fuel . They are in a ratio of l5 to 1 .
每 1 份燃料有 15 份空气。它们之比为 15 比 1。
The air / fuel ratio is 15:1 .
空气与燃料之比为 15:10
The efficiency is denned as the ratio of the output to the input．
效率可定义为输出功率与输入功率之比。
This force is inversely proportional to the square of the distance between the bodies．
这个力与物体之间的距离的平方成反比。
During expansion the pressure varies inversely as the volume .
在膨胀时，压力的变化与体积成反比。
Pressure is in inverse proportion to volume．
压力与体积成反比。
The solubility of CO2 in sea water is inversely dependent upon the temperature of the water .
二氧化碳在海水中的溶解度与水的温度成反比。
The higher the velocity of steam , the greater is the turbine speed．
蒸汽的速度越高，涡轮的转速越大。
The higher up we go , the smaller and lighter are the grains of dust in the air．
我们飞得越高，空气中的尘粒就越小越轻。
(参见 proportion , ratio 等词条)
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