Echinopsine
蓝刺头碱
🗣️ 情景例句
I have worked hard at my major subject.
我对主修课特别用功。
Have you ever thought about a career in the medical profession?
你曾经在医药专业考虑职业吗？
why have we had no visitors from outer space yet?
那么我们为什么还未见到外层空间来访的客人呢？