Polyacetylen
聚乙炔; 聚乙炔
🗣️ 情景例句
He was in trouble with the Customs.
他在海关那里有了麻烦。
A good tale is none the worse for being twice told.
好故事百听不厌。
Come to school in your old clothes tomorrow!
明天上学时请穿旧衣服来！