Polydiene
聚二烯
🗣️ 情景例句
let me give you some additional thoughts and ideas I have.
让我提出一些另外的想法。
It is too late to shut the stalbe door when the steed is stolen.
失马锁厩，为时已晚；贼去关门，为时已迟。
He found it very difficult to get to sleep and he was rather angry with the man upstairs.
他觉得这样很难入睡， 他对楼上的人相当生气。