Eigenpolynomial
特征多项式
🗣️ 情景例句
He lives alone
他一个人生活
How about Mary? How long has she lived there?
玛丽怎么样？她在那儿住多久了？
Mrs.Richards sent her children to school and went upstairs to her bedroom.
把孩子送去上学，然后来到楼上自己的卧室。