Acetyloxide
氧化乙酰, 醋(乙)酐
🗣️ 情景例句
Well, I wasn't clear about my future,
我对自己的未来当时也不清楚，
I didn't know whether to send the letter airmail or not.
我不知道是否送航空邮件。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。