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代码中有一个语法错误。在路由配置中，about 的子路由 governance 的配置缺少了一个大括号，需要在其后加上一个 }。正确的配置应该如下：

{
    path:'/about',
    component:about,
    children:[
        {path:'detail',component:detail},
        {path:'governance',component:governance}
    ]
},