英语翻译It is true,however,that the concentration of each reacta

的确如此,然而,每种反应物和生成物在化学平衡时是都常量,因为它在一个反应中消耗的速率和在负反应中生成的速率是相等的.
It is true,however,that the concentration of each reactant and product at equilibrium remains constant because the 《rate》 （at which it is being used up in one reaction） is equal to the 《rate》 （at which it is being formed by the opposite reaction）.两个定语从句,先行词《》表示,从句为（）部分