docs(cn): translate content/warnings/special-props.md into Chinese #112
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content/warnings/special-props.md
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| Most props on a JSX element are passed on to the component, however, there are two special props (`ref` and `key`) which are used by React, and are thus not forwarded to the component. | ||
| 大部分 JSX 元素上的 props 都会被传入给组件，然而，有两个特殊的 props （`ref` 和 `key`） 已经被 React 所使用，因此不会被传入给组件。 |
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大部分 JSX 元素上的 props 都传递给组件。但 React 占用了两个特殊的 props，
ref和key，所以不会被传递给组件。
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传入给我觉得可以改成【传递给】这样更通顺一些，你觉得呢？
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「传入」？
（考虑到 隐含了一个方向的信息）
content/warnings/special-props.md
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| For instance, attempting to access `this.props.key` from a component (i.e., the render function or [propTypes](/docs/typechecking-with-proptypes.html#proptypes)) is not defined. If you need to access the same value within the child component, you should pass it as a different prop (ex: `<ListItemWrapper key={result.id} id={result.id} />`). While this may seem redundant, it's important to separate app logic from reconciling hints. | ||
| 举个例子，在组件中试图获取 `this.props.key` （比如通过 render 函数或 [propTypes](/docs/typechecking-with-proptypes.html#proptypes))）将是未定义的。如果你需要在子组件中获取相同的值，你应该用一个不同的 prop 来传入它（例如：`<ListItemWrapper key={result.id} id={result.id} />`）。虽然这似乎是多余的，但是将应用程序逻辑和辅助信息分开是很重要的。 |
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举个例子，在组件中试图读取
this.props.key（比如通过 render 函数或 propTypes)）将得到 undefined. 如果你需要在子组件中获取相同的值，你应该用一个不同的 prop 传入这个值（例如：<ListItemWrapper key={result.id} id={result.id} />）。这看似是多余的，但是将应用程序逻辑和协调提示（reconciliation hint）分开是很重要的。
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- 未定义用 undefined 表达会不会更清晰一些？
- reconciliation hint 是 react 的协调算法中用到的协调提示，这里建议把原文带上
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https://stackblitz.com/edit/react-special-props
waring 重现