Phosphatidalcholine
缩醛磷脂酰胆碱
🗣️ 情景例句
Concerned about whom?
为谁担心
What are you doing?
你正在做什么？
The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion dollars.
哈勃望远镜于1990年4月20日由国家航空航天局发射升空，耗资10多亿美元。