diff --git a/3dterm.md b/3dterm.md
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+# 3D engine in the terminal
+display something in the terminal in the form of 3D.
+---
++ iterm file
++ display file
++ a engine
diff --git a/terminal.md b/terminal.md
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-# 3D engine in the terminal
-display something in the terminal in the form of 3D.
----
-### Principle
-+ graph-described file
-+ picture-displayed file
-+ a engine to process the file and output ascii pictures-displayed file
-+ a converter to tranform pictures-displayed file into something displayed in the terminal
-