Sepharose
琼脂糖(凝胶)
🗣️ 情景例句
There are, Ellen.
一定有， Ellen。
In university, students are trained to become doctors and nurses.
大学的学生被训练成为医生和护士。
How are you getting to the airport? Is anybody seeing you off?
你打算怎样去机场？有人送你吗？