What you get is in direct proportion to what you give.
你所得到的与你所付出的成正比。
Ability is always in direct proportion to the effort.
能力永远和曾经的付出成正比。
The hardness of material is not in direct proportion to the wear resistance.
材料的硬度和耐磨性不成正比；
The hardness of material is not in direct proportion to the wear resistance.
材料的硬度和耐磨性不成正比；
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