Polynonamethylene adipate
[化] 聚己二酸亚壬基酯
🧩 词语组成解析
己二酸
🗣️ 情景例句
It took years of hard work.
那需要多年辛苦工作。
No, I only wrote her one letter this year.
是的，今年我才给她写过一封信。
We offer a discount for large orders.
我们对大量订购有打折。