Polymethylene derivatives
[建] 聚甲烯衍生物
🧩 词语组成解析
n. [化]聚亚甲基
派生物
🗣️ 情景例句
555-9470…and it's busy….
555-9470……还是忙音 ……
Thank you very much.
非常感谢大家。
Yes, they're free. But there's usually a long line.
是的，免费。但常常要排长队。