Isospray
氯乙烯均聚物
🗣️ 情景例句
since this is so easy ....
既然那么简单……
It has been a long time since last came here.
自从我上次来这里已经有很长时间了。
You mustn't come home late.You must be home at half past ten.
你不准回家太晚，你必须在10点半到家。