Polymer degradation
[化] 聚合物降解
🧩 词语组成解析
🗣️ 情景例句
It's almost lunchtime, and no fish yet.
差不多到午餐时间了， 还没钓到鱼。
I enjoyed the movie very much. I wish I had read the book from which it was made.
电影不错，我希望我读过原著。[wish + 主语 = 过去完成时 = 愿望之事在wish以前发生。]
That's right.I drove it into a lamp-post.
是啊。我把汽车撞在电线杆上了。