Xanthopterin
黄蝶呤, 2-氨基-4, 6-二羟基蝶呤
🗣️ 情景例句
There has been very little progress this term.
这学期没有什么进步。
Who keeps company with the wolf will learn to howl.
近朱者赤，近墨者黑。
Please do. We 're desperate for the material.
麻烦你了，我们非常需要这些材料。