Polyacetylen
聚乙炔; 聚乙炔
🗣️ 情景例句
but I know what it feels like to miss someone.
但我知道想念一个人是什么样的滋味。
I often have breakfast in the morning.
我常常在早上吃早餐。
The students walked through the gates with Uncle Wang.
学生们跟随王大叔走进大门。