diff --git a/Assignments/Assignment8/source/作业8_21281280_柯劲帆.md b/Assignments/Assignment8/source/作业8_21281280_柯劲帆.md
index 7b4cc8b..38f9190 100644
--- a/Assignments/Assignment8/source/作业8_21281280_柯劲帆.md
+++ b/Assignments/Assignment8/source/作业8_21281280_柯劲帆.md
@@ -309,6 +309,8 @@ INSERT INTO accounts (id, balance) VALUES (1, 1000.00), (2, 2000.00);
 
 用户1连续两次读取数据，发现读取的数据不一致，体现出不可重复读。
 
+ MySQL 修复了丢失修改问题，因此无法实现丢失修改情景。
+
 ### 2.2.3. 可重复读（REPEATABLE READ）
 
 幻读：
diff --git a/Assignments/Assignment8/作业8_21281280_柯劲帆.pdf b/Assignments/Assignment8/作业8_21281280_柯劲帆.pdf
index 660bce8..6d6adb7 100644
Binary files a/Assignments/Assignment8/作业8_21281280_柯劲帆.pdf and b/Assignments/Assignment8/作业8_21281280_柯劲帆.pdf differ