Fix section "Static routing" in 13.2.md

en/13.2.md

@@ -124,14 +124,14 @@ Its detailed implementation is as follows:
 	
 ### Static routing
 
-Above we achieve the realization of dynamic routing, Go the http package supported by default static file handler FileServer, because we have implemented a custom router, then the static files also need to set their own, beego static folder path stored in the global variable StaticDir, StaticDir is a map type to achieve the following:
+We've implemented dynamic routing in our example above. By default, Go's `http` package supports serving static files with `http.FileServer`, which return a `Handler`. Since we have implemented a custom router, we will also need a way of handling static files. Beego's static folder path is saved in a global variable called `StaticDir`, which maps URL to corresponding paths. The `SetStaticPath`'s implementation can be seen below: 
 
 	func (app *App) SetStaticPath(url string, path string) *App {
 		StaticDir[url] = path
 		return app
 	}
 
-Applications can use the static route is set to achieve the following manner:
+The application's static routes can be set like so:
 
 	beego.SetStaticPath("/img", "/static/img")