来自proportion,比例，匀称。

1. Salary is proportional to years of experience.

薪金视资历而定。

2. The dwarf's long arms were not proportional to his height.

那侏儒的长臂与他的身高不成比例.

3. The increase of wages is proportional to the rise in prices.

工资的增长与物价的上涨是成比例的.

4. The output should be proportional to the input.

输出应当与输入成比例.

5. The size of the nebula at this stage is inversely proportional to its mass.

这个阶段星云的大小与其质量成反比。