modulus-to-density ratio

例句：

1. 1.In engineering, the modulus-to-density ratio is crucial for determining material properties.
   在工程中，模量与密度比对于确定材料属性至关重要。
2. 2. The engineer used this ratio to optimize the design of the bridge.
   这位工程师利用这个比率来优化桥梁的设计。
3. 3. The density of the material can be determined by measuring its modulus-to-density ratio.
   通过测量材料的模量与密度比可以确定其密度。