Polyacetals
聚缩醛(树脂)
🗣️ 情景例句
I've been moonlighting for years.
我几年来一直兼职。
What time are you going to get up tomorrow morning?
你将在明天早上什么时间起床？
Notices forbidding the open-air drying of clothes, or the use of water points for car washing,
禁止露天晒衣服、禁止用水龙头冲洗汽车的布告