Polycondensate
缩聚物
🗣️ 情景例句
I must say the products in Shanghai have improved very much in the past ten years.
我得承认上海的产品这十年来进步了很多。
A present!
有礼物！
I'm sorry, I can't find it. I thought it was in my coat.
对不起，我的票找不到了。我原来以为是放在大衣里。