1. electric current is directly proportional to voltage and inversely proportional to resistance; I = E/R. 
   电流与电压成正比,与电阻成反比:i=e/r。
2. In a constant resistance D.C circuit the current will vary directly proportional to the voltage. 
   在电阻不变的直流电路中，电流和电压成正比。
3. The natural force of attraction between any two massive bodies, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. 
   万有引力任何两个巨大物体间的自然吸引力，与他们的质量成正比，并与其两者间距离的平方成反比
4. (physics) the law that states any two bodies attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. 
   （物理）两个物体相互吸引的力度与其物质质量成正比但与其距离之平方成反比的定律。
5. (chemistry) the law that states the rate of a chemical reaction is directly proportional to the molecular concentrations of the reacting substances. 
   （化学定律）:化学反应的速度与其反应物质的分子浓度成正比。

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