Submatrix
[计] 子矩阵
🗣️ 情景例句
And right now, he needs a friend.
而且现在， 他需要一个朋友。
The menu is dirty, Would you bring me a clean one, please?
这菜单是脏的，请你拿个干净的给我。
We are less credulous than we used to be.
我们不再像以往那样轻易相信别人了。