Ketoestrone
酮雌(甾)酮
🗣️ 情景例句
He started with them almost forty years ago.
他在那里做了快四十年了。
So far I have been learning about China.
到止前我止，我一直都在研究中国的事情。
I knew that experts from the local museum would soon visit the cave.
我知道本地博物馆的专家会很快到山洞来探访。