Verofylline
二氢二甲基甲丁基嘌呤二酮
🗣️ 情景例句
I can see that you've done this before.
我发觉你曾干过此事。
How much is a round-trip ticket to Beijing?
一张到北京的来回票要多少钱？
'No', I answered confidently.
“没有。”我自信地回答说。