Terpolymerization
三聚作用
??? 情景例句
Sit down. Sit down.
請坐。請坐吧。
There is nothing either good or bad, but thinking makes it so.
事情本無好與壞，全在自己怎么想。
Just then, the gaoler appeared with the precious letter in his bands.
這時獄卒上場，手里拿著那封珍貴的信。