Perfluorocyclopropane
全氟环丙烷
🗣️ 情景例句
I'm pleased to meet you, Mr. Peter.
皮特先生，很荣幸认识你。
I'm so sorry.
十分抱歉！
He had hardly had time to settle down when he sold the house and left the country.
还没等安顿下来就卖掉了房子，离开了这个国家。