删英文

删英文，看起来很乱

Author: bhnddowinf

src/guide/render-function.md

@@ -358,17 +358,14 @@ Vue.component('my-component', {
 
 函数化组件只是一个函数，所以渲染开销也低很多。但同样它也有完整的组件封装，你需要知道这些， 比如：
 
-Since functional components are just functions, they're much cheaper to render. They're also very useful as wrapper components. For example, when you need to:
 
 - 程序化地在多个组件中选择一个
 - 在将 children, props, data 传递给子组件之前操作它们。 
 
-- Programmatically choose one of several other components to delegate to
-- Manipulate children, props, or data before passing them on to a child component
+
 
 下面是一个依赖传入 props 的值的 `smart-list` 组件例子，它能代表更多具体的组件：
 
-Here's an example of a `smart-list` component that delegates to more specific components, depending on the props passed to it:
 
 ``` js
 var EmptyList = { /* ... */ }