Polymethylene
n. [化]聚亚甲基
🗣️ 情景例句
But who's going to pay for all of this?
但谁来为这些付钱呢？
My brothers must help with the house work at home.
我的兄弟在家里必须帮忙做家务。
Have they ever been there before?
他们以前去过那儿吗？