Polymethylene
n. [化]聚亚甲基
🗣️ 情景例句
It was so nice to be out in the country.
出去置身乡下真是太好了。
May I ask you a question?
我可以向您提个问题吗？
This is not easy, and may require two porpoises working together.
这并非易事，可能需要两只海豚合伙干才行。