diff --git a/The-Art-of-Linear-Algebra-zh-CN.pdf b/The-Art-of-Linear-Algebra-zh-CN.pdf
index b4c4ba7..4020c82 100644
Binary files a/The-Art-of-Linear-Algebra-zh-CN.pdf and b/The-Art-of-Linear-Algebra-zh-CN.pdf differ
diff --git a/The-Art-of-Linear-Algebra-zh-CN.tex b/The-Art-of-Linear-Algebra-zh-CN.tex
index 57e6e36..c09cabf 100644
--- a/The-Art-of-Linear-Algebra-zh-CN.tex
+++ b/The-Art-of-Linear-Algebra-zh-CN.tex
@@ -362,7 +362,7 @@ $A=CR$将$A$化简为$r$的线性无关列$C$和线性无关行$R$的乘积.
   \caption{$CR$中列的秩}
 \end{figure}
 
-现在你会发现行的秩为2, 因为$C$中只有2个线性无关列. 
+现在你会发现列的秩为2, 因为$C$中只有2个线性无关列. 
 而$A$中所有的列都可以由$C$中的2列线性表出. 
 
 \begin{figure}[H]
@@ -371,7 +371,7 @@ $A=CR$将$A$化简为$r$的线性无关列$C$和线性无关行$R$的乘积.
   \caption{$CR$中行的秩}
 \end{figure}
 
-同样, 列秩也为2, 因为$R$中只有2个线性无关行, 且$A$中所有的行都可以由$R$中的2行线性表出. 
+同样, 行秩也为2, 因为$R$中只有2个线性无关行, 且$A$中所有的行都可以由$R$中的2行线性表出. 
 
 \subsection{$\boldsymbol{A=LU}$}