Polyacetals
聚缩醛(树脂)
🗣️ 情景例句
I'm sure everyone will be very happy with these gifts.
相信他们一定会喜欢这些礼物的。
We'd better not go out tomorrow, son.
孩子，我们明天最好不要出去。
It is clear that the cat has eaten it!
很明显，是猫偷吃的！