diff --git a/Part.3.B.3.decorator-iterator-generator.ipynb b/Part.3.B.3.decorator-iterator-generator.ipynb
index 60ebda25a..1f0ace8a9 100644
--- a/Part.3.B.3.decorator-iterator-generator.ipynb
+++ b/Part.3.B.3.decorator-iterator-generator.ipynb
@@ -849,7 +849,7 @@
     "    ...\n",
     "```\n",
     "\n",
-    "等价与\n",
+    "等价于\n",
     "\n",
     "```python\n",
     "def a_func():\n",