Catastrophe theory
[化] 突变论
🧩 词语组成解析
🗣️ 情景例句
Hello, it's good to see you again.
很高兴又见到你。
How much is a one-way ticket?
单程车票多少钱一张？
After the train had left the station, the lady opened her handbag and took to her power compact.
火车开出车站后，那位妇女找开了手提包，拿出了粉盒。