Polymethacrylonitrile
[化] 聚甲基丙烯腈
🗣️ 情景例句
Well, that's life, isn't it?
这就是生活，不是吗？
It won't happen again.
下不为例。
But in an old man who has known human joys and sorrows,
可是老年人已经饱尝了人间的甘苦，