Underdeterminant
子行列式
🗣️ 情景例句
In the meantime, what would you like?
对了， 你想要点什么？
Choose an author as you choose a friend.
选书如择友。
There is a zoo, an art museum, a boating lake, a smaller lake for model boats and, in winter, an ice-skating area.
还有一个动物园、一座艺术博物馆，一个供人划船用的湖。另有一个比较小的湖，供人们玩模型船艇，冬天就成为滑冰场。