Betulonic acid
[机] 桦木酮酸
🧩 词语组成解析
🗣️ 情景例句
I can barely move.
我简直动不了啦。
Who wrote that music?
那首音乐是谁写的？
These satellites go round the earth and help us to learn more about the earth, the weather and other things.
这些卫星绕着地球转，帮助我们更好地了解地球、天气和其他情况。