Perioidic system
[机] 周期系
🧩 词语组成解析
🗣️ 情景例句
May I speak to Miss Chen?
可以跟陈小姐讲话吗？
She is the most gracious hostess I have ever known.
她是我所见过的最和蔼的女主人。
When they had all made themselves comfortable, a stranger appeared.
当他们都已安排舒适时，一个陌生人出现了。