Polyacetals
聚缩醛(树脂)
🗣️ 情景例句
Good morning, Mr. Smith. I brought the contract you are been looking for.
上午好，斯密司先生。我带来了你要等待的合同。
If you expect to enter the university,you should apply now.
如果你期望进入大学，你现在应该申请。
I still think we should buy the IBM PC586.
我仍然认为我们应该买IBM586的。