Xanthopterin
黄蝶呤, 2-氨基-4, 6-二羟基蝶呤
🗣️ 情景例句
When's the last time you took a vacation?
上次你去度假是什么时候？
One of the real pluses of this product is that it is of very high quality and of compact size.
这种产品的真正优点之一就是高质量和小体积。
You played beautifully.
你弹得太美了。