Dioxopurine
黄嘌呤
🗣️ 情景例句
The old couple has already been married for fifty years.
那对老夫妻结婚已经 50 年了。
He gets more professional satisfaction from teaching.
从事教育职业，他更感受到职业上的满足。
they must be sedulously tended, if the vivifying fruits are to be at hand when needed.
要想在需要的时候可随手摘取充满生机的果实，还需要勤勉地护理。