Valence shells
[電] 價層
?? 詞語組成解析
valence
[['veil?ns]]
n. 原子價\\n[化] 化合價; 原子價
n. 貝殼（shell的復數）
??? 情景例句
with the school board,
和聯合校董會一起，
When can you pick up your ticket?
你什么時候可拿到車票呢？
4 Think of a time when you were happiest. What were you doing?
4。想一想你感到最高興的時刻。當時你在做什么？