Bipolymer
二(元共)聚物
🗣️ 情景例句
Don't be such a grouch.
不要总是牢骚满腹。
A lazy youth, a lousy age.
少壮不努力，老大徒伤悲。
After that day they were separated, never to see each other again.
那日一别，他们再没重逢。