Polyacid
a. 多酸的
🗣️ 情景例句
because we have a little surprise for you today.
因为今天我们要给各位一项惊喜。
Thank you for your kind cooperation.
谢谢您的合作。
where chance discoveries play a much larger part than they do in physical and mechancal industries.
同物理和机械工业相比，化学工业中偶然发现的机会要多得多。