Dimethylxanthine
[医] 二甲黄嘌呤, 可可豆硷
🗣️ 情景例句
Nice to meet you, Mrs. Cooper.
很高兴见到你， Cooper太太。
What's Hong Kong famous for?
香港以什么闻名？
The boy was too nervous to speak.
那男孩紧张得说不出话来。