grinding teeth的用法和樣例：
例句
- The child grinds his teeth in his sleep.
這孩子在睡眠中磨牙。 - All night he grinds his teeth together, keeping me awake.
他一晚上都在磨牙，弄得我睡不著覺。 - In this paper, the moving laws at any point of meshing discharge are stuied about internal gears E.D.M. grinding.
從微觀角度研究內齒輪電火花磨齒任意嚙合放電處形成的放電通道中等粒子體的運動規律。
