Submatrix
[计] 子矩阵
🗣️ 情景例句
That ain't the way I need it.
据我所知，不时那么会事。
They could imagine who was at the door.
他们无法想象门那边有谁在。
A short while ago, my sister helped me to carry one of my old bookcases up the stairs.
几分钟前，我妹妹帮我把一个旧书橱抬上了楼。