Xanthopterin
黄蝶呤, 2-氨基-4, 6-二羟基蝶呤
🗣️ 情景例句
Lillian Winters.
Lillian Winters。
I went to see my doctor for a check-up yesterday.
我昨天为检查去看了医生。
An old watch, by contrast,
然而一只老掉牙的手表，