diff --git a/README.HOW_DOES_IT_WORK.zh-CN.md b/README.HOW_DOES_IT_WORK.zh-CN.md
index 78eaf05..ddf3d11 100644
--- a/README.HOW_DOES_IT_WORK.zh-CN.md
+++ b/README.HOW_DOES_IT_WORK.zh-CN.md
@@ -14,15 +14,19 @@ WinRAR 使用了基于 ECC 的签名算法来生成 `rarreg.key` 文件，其使
 各项系数全部位于 ![GF2p15-inlined](assets/formula/GF2-inlined-light.svg#gh-light-mode-only)![GF2p15-inlined](assets/formula/GF2-inlined-dark.svg#gh-dark-mode-only)。设基域的标准基为：
 
 <p align="center">
-    <img src="http://latex.codecogs.com/svg.latex?B_1%3D%5C%7B1%2C%5Calpha%2C%5Calpha%5E2%2C%5Cldots%2C%5Calpha%5E%7B14%7D%5C%7D")
+    <img src="assets/formula/2-light.svg#gh-light-mode-only">
+    <img src="assets/formula/2-dark.svg#gh-dark-mode-only">
 </p>
 
+
 则位于基域 ![GF2p15-inlined](assets/formula/GF2p15-inlined-light.svg#gh-light-mode-only)![GF2p15-inlined](assets/formula/GF2p15-inlined-dark.svg#gh-dark-mode-only) 上的元素 ![A-inlined] 可以用如下方式表达：
 
 <p align="center">
-    <img src="http://latex.codecogs.com/svg.latex?A%3D%5Csum_%7Bi%3D0%7D%5E%7B14%7Da_i%5Calpha%5Ei%20%5Cquad%20%5Cquad%20%5Cquad%20a_i%5Cin%5Ctextrm%7BGF%7D%282%29")
+    <img src="assets/formula/3-light.svg#gh-light-mode-only">
+    <img src="assets/formula/3-dark.svg#gh-dark-mode-only">
 </p>
 
+
 ---
 
 复合域 ![GF2p15p17-inlined](assets/formula/GF2p15p17-inlined-light.svg#gh-light-mode-only) ![GF2p15p17-inlined](assets/formula/GF2p15p17-inlined-dark.svg#gh-dark-mode-only) 的不可约多项式为：
diff --git a/assets/formula/2-dark.svg b/assets/formula/2-dark.svg
new file mode 100644
index 0000000..7f9ecb5
--- /dev/null
+++ b/assets/formula/2-dark.svg
@@ -0,0 +1,38 @@
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