ordinary differential equations(微分方程) 比 differential equations(常微分方程) 难多少?

ordinary difference,differentia,differentiation有什么区别是differentia,一个名词能不能解释得再清楚一点啊,例句弄个简单点的或者付上翻译吧 an ordinary ordinary interpretation ordinary''是什么意思? ordinary音标 ordinary意思 ordinary是什么意思 Anything But Ordinary 普通人 ORDINARY PEOPLE怎么样 General mood,ordinary person ordinary friends是什么意思? general ordinary 是什么 意思 Ordinary Least Square the reach of ordinary extraordinary,ordinary的不同 ordinary 的反义词? regular,ordinary的区别