The plane wave solution and spherical wave solution to free particles are also given.
在自由粒子的情况下给出了粒子的平面波解和球面波解。
Regular use helps engine run clean and free of harmful dirt and metallic particles.
一般的使用帮助引擎跑干净和免于有害的污垢和金属的粒子。
A gas completely fills its container. The particles are free to move about.
气体会将容器完全填充满，粒子可自由移动。
A gas completely fills its container. The particles are free to move about.
气体会将容器完全填充满，粒子可自由移动。
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