1. Seasonal commutation replace eternity is changeless, and the index of tide always is metabolic multiterminal however. 季节的变换更替永恒不变，而潮流的指标却总是变化多端。
2. As the driver of the micro multi-rotor craft, the micro BLDC motor was of simple structure, easy fabrication, non commutation spark and so on. 作为多旋翼微直升机的驱动器，微型无刷直流电动机具有结构简单、制造方便、无换向火花等特点。
3. Based on electrical circuit theory, the formulation of the relation between mutual admittance and converter commutation voltage of the multi-infeed HVDC system was given. 基于电路基本理论知识，推导出多馈入交、直流并联的高压直流输电系统耦合导纳和换相电压关系表达式。
英英解释
n.
1. the travel of a commuter
2. a warrant substituting a lesser punishment for a greater one
3. (law) the reduction in severity of a punishment imposed by law
4. the act of putting one thing or person in the place of another:
