Polyacetylen
聚乙炔; 聚乙炔
🗣️ 情景例句
They ask questions like Do you have any brothers or sisters?.
他们常问一些像“你有兄弟姐妹吗？”。
How many languages do you speak?
你说多少种语言？
Were there any letters for me this morning?
今天早上有我的信吗？