Ⅵ. The adjective 1. as a post-modifier 现有的化学书均提到了这一反应。 The chemistry books available all mention this reaction obtainable, achievable, possible. 个原子中的质子数等于存在的电子数 The number of protons in an atom is equal to that of electrons present.Ⅵ. The adjective 1. as a post-modifier 现有的化学书均提到了这一反应。 The chemistry books available all mention this reaction. obtainable, achievable, possible… 一个原子中的质子数等于存在的电子数 The number of protons in an atom is equal to that of electrons present