particle population

• 粒子数

particle population的用法和样例：

例句

1. The necessary population inversion can be achieved in a variety of ways.
   我们可以用各种方法来实现这种必要的粒子数反转。
2. The incompressibility of the fluid is determined by introduction of a so-called particle density number.
   流体的不可压缩性是通过引人粒子数密度概念实现的。