different mass groups

• 不同群体

different mass groups的用法和样例：

例句

1. To propel education equity is the key approach to narrowing the gap of labor resources of different social groups.
   推进教育的奋平，是缩小不同群体之间人力资本存量差距的根本途径。
2. The photosynthetic characters of rice were different in different plant populations.
   不同群体下，水稻的光合特性发生明显变化。