First-order System,First-order logic 分别是什么?

First-order System,First-order logic 分别是什么? first trial order pseudo-first-order reaction翻译 first order derivative second order derivative partial deriv “first order of business”这个短语什么意思? FIR THE FIRST ORDER 100% ADVANCED AT THE MOMENT OF THE ORDER in order to catch the first bus 与 to catch the first bus有神魔不 order 汇票At sight of this First of exchangepay to the order of意思 翻译：Please rush the first order and send me pictures of the f The first thing you must remember is that,in order to succee 虚拟语气：They got up early in order that they______ their first