Percolumbic acid
[化] 过铌酸
🧩 词语组成解析
🗣️ 情景例句
What impressed you the most about Shanghai?
你对上海最深的印象是什么？
Do you want to change before the banquet?
宴会前你想换衣服吗？
He was just falling asleep when there was a loud knock at the door.
他刚要入睡，就有人很响地敲门。