Oxyindole
羟基吲哚
🗣️ 情景例句
I reminded him to work hand.
我提醒他要用功。
Friendless is the dead.
没有朋友者，等于是死人。
There is only one difference between an old man and a young one:
老年人和年轻人之间仅仅有一个不同：