Submatrix
[计] 子矩阵
🗣️ 情景例句
Let's meet more often.
让我们常见面。
How did this happen?
怎么会这样？
I'm tired, said my younger brother as he climbed up to join me.
“我累了，”我弟弟边说边爬上岩石和我汇合。