diff --git a/simulators/mpl/mpl_2d_simulator_arrow.py b/simulators/mpl/mpl_2d_simulator_arrow.py
index 6d1298b0187a26a8df5f13993f81bf2d7b579283..673069e0de8802956a295e03c8e75b1ab0da0b64 100644
--- a/simulators/mpl/mpl_2d_simulator_arrow.py
+++ b/simulators/mpl/mpl_2d_simulator_arrow.py
@@ -119,7 +119,7 @@ def 场景2():
 
     vxA, vxB = 0, 0
     # https://latex.codecogs.com/svg.image?\frac{G.mA.mB}{(r1+r2)^{2}}%20=%20mA.\frac{vA^{2}}{r1}=%20mB.\frac{vB^{2}}{r1}
-    # https://latex.codecogs.com/svg.image?\frac{G.m_{A}.m_{B}}{(r_{1}+r_{2})^{2}}%20=%20m_{A}.\frac{v_{A}^{2}}{r_{1}}=%20m_{B}.\frac{v_{B}^{2}}{r_{1}}
+    # https://latex.codecogs.com/png.image?\dpi{300}\frac{G.m_{A}.m_{B}}{(r_{1}+r_{2})^{2}}%20=%20m_{A}.\frac{v{_{A}}^{2}}{r_{1}}=%20m_{B}.\frac{v{_{B}}^{2}}{r_{1}}
     # 万有引力常量 *mA * mB/ math.pow(r1+r2,2) = mA*math.pow(vyA,2)/r1
     # https://latex.codecogs.com/svg.image?vyA%20=%20\sqrt{\frac{G.mA.mB}{(r1+r2)^{2}}*\frac{r1}{mA}}
     # https://latex.codecogs.com/svg.image?v_{Ay}%20=%20\sqrt{\frac{G.m_{A}.m_{B}}{(r_{1}+r_{2})^{2}}*\frac{r_{1}}{m_{A}}}