Dimethylxanthine
[醫(yī)] 二甲黃嘌呤, 可可豆鹼
??? 情景例句
You should write about your education first.
你應該在開頭就談到你的教育情況。
A little neglect may breed great mischief.
小不忍則亂大謀。
The shortest answer is doing.
最簡短的回答是干。