Pva
abbr. 聚醋酸乙烯酯（Polyvinyl Acetate）；聚乙烯醇（Polyvinyl Alcohol）；垂直取向构型（Patterned Vertical Alignment）
🗣️ 情景例句
It's no use crying over spilt milk. What's done cannot be undone.
覆水难收。
Hasty climbers have sudden falls.
大起者有大落。
Here you are, children.
拿着，孩子们。