Cobalamine
[化] 钴胺素
🗣️ 情景例句
Thanks for everything, if you ever need a favor in return, just let me know.
感谢你所做的一切，如果你需要我帮忙的话，尽管开口吧。
He is in conference.
他正在开会。
I live in a tall building in the city of Beijing.
我住在北京市的一幢高楼里。