Polyacetylen
聚乙炔; 聚乙炔
🗣️ 情景例句
Thank you for your reassurance, Dr. Stewart.
谢谢你消除了我疑虑，Stewart大夫。
Idleness is the rust of the mind.
懒惰使脑子生锈。
May I propose that we break for coffee now?
我可以提议休息一下，喝杯咖啡吗？