例句與造句

1. one way to simplify the problem is to divide the electrons into two groups : the 36 core electrons, and the two 4s valence electrons
   簡(jiǎn)化此問(wèn)題的一個(gè)方法是把電子分成兩組：36個(gè)原子實(shí)電子和2個(gè)4s價(jià)電子。
2. It's difficult to find core electrons in a sentence. 用core electrons造句挺難的