minor

Ch2-3-SoftwareLanguage.tex

@@ -71,8 +71,8 @@
 \tikzstyle{optional}=[dashed,fill=gray!50]
 \begin{figure}
 \begin{tikzpicture}[%
-  grow via three points={one child at (0.5,-0.7) and
-  two children at (0.5,-0.7) and (0.5,-1.4)},
+  grow via three points={one child at (0.5,-0.65) and
+  two children at (0.5,-0.65) and (0.5,-1.3)},
   edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}]
   \node{程序设计语言主要研究内容}
     child {node{语言设计}