Methylxanthine
[医] 甲基黄嘌呤, 杂黄嘌呤
🗣️ 情景例句
Pleased to meet you.
很高兴与你见面。
He is most noticeable for his southern accent.
他有很浓重的南方口音。
The days get longer and the nights get shorter.
白天变长了，黑夜变短了。