成正比
be directly proportional或direct proportion 比如：The electric current varies directly with the voltage.
电流与电压成正比。
成反比
be inversely proportional to 比如：The velocity of the fluid is inversely proportional to the spacing of the streamlines.
流体的流速与流线的间距成反比。
成反比
be inversely proportional to
成正比
be directly proportional to
be inversely proportional to
成正比
比如：The electric current varies directly with the voltage.
电流与电压成正比。
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