转动 zhuǎndòngzhuàndòng HSK4 rotate Definitions Defs Origin Strokes Stroke Words Sentences Sents 转动惯量 zhuǎndòngguànliàng moment of inertia moment of inertia (mechanics)转动件 zhuàndòngjiàn rotor 转动轴 zhuàndòngzhóu axis the theoretical line about which a body rotates