Underdeterminant
子行列式
🗣️ 情景例句
How did you get on in your exam?
你考得怎样？
He was so startled that he yelled.
他惊吓得高声喊叫。
Oh, very well. Then there is nothing to worry about. I apologize. (Hands him the note.)
哦，那太好了，没什么可犯愁的了。我向你道歉。（把钞票递给他）