proportional loading

例句：

1. 1.The design of the building is proportional to its size.
   这栋建筑的设计与其大小成正比。
2. 2.The company's profitability is proportional to its market share.
   公司的盈利能力与其市场份额成正比。
3. 3. The weight of the load is proportional to its volume.
   负载的重量与其体积成正比。