Tautomerism
n. 互变现象\\n[化] 互变异构现象
🗣️ 情景例句
It's dangerous to leave your children along while you go shopping.
购物时，把你的孩子单独留在家里是挺危险的。
What's your nationality?Are you a Chinese?
你的国籍是什么？你是中国人?
Was that the 21st?
21号吗？