Bilidien
胆汁二烯, 二烯胆色素核
🗣️ 情景例句
We're in the country.
我们在乡村。
I'm sorry, but I can't find the book you lent me.
很抱歉！我找不到你借给我的那本书了。
'No', I answered confidently.
“没有。”我自信地回答说。