Polycoumarone
[化] 聚香豆酮; 聚氧杂茚
🗣️ 情景例句
Look before you leap.
想好了再行动。
My brother is two years younger than I am.
我的兄弟比我年轻2年。
A Festival for the Dead is held once a year in Japan.
日本每年过一次“亡灵节”。