常: ordinary; common; normal差: send on an errand; dispatch常差分方程: ordinary difference equation反常差错率: abnormal error rate异常差错: abnormal error常差分微分方程: ordinary difference differential equation常藏: tsunezo常参数线性系统: linear time invariant system; linear time-invariant system常柴股份有限公司: changchai company limited常参加音乐会者: concertgoer常产玻璃纤维: staple glass fibre常步前进: march at ease常产量: constant rate of production常步, 用普通步子: at a walk