Salary is proportional to years of experience.

薪金视资历而定。

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

这个阶段的星云大小与其质量成反比。

Loss of weight is directly proportional to the rate at which the disease is progressing.

体重减轻和该病的发展速度成比例。

Newton discovered that any two objects in the universe attract each other, and that this force is proportional to their mass.

牛顿发现宇宙中任何两个物体都相互吸引，而且这股引力与它们的质量成比例。

It is found that the canonical momentum is directly proportional to the gradient of space phase.

发现正则动量与空间相的梯度成正比。