Xanthine
n. 黄质, 黄嘌呤\\n[化] 黄嘌呤
🗣️ 情景例句
He always performs his tasks perfectly.
他总是圆满地完成工作。
We have an extended warranty available at extra cost.
对于额外价钱我们有较长的保证期限。
Are these English books?
这些是英语书吗？