zhuxiaoshang commented on a change in pull request #13225:
URL: https://github.com/apache/flink/pull/13225#discussion_r487680982
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File path: docs/dev/user_defined_functions.zh.md
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@@ -114,30 +119,31 @@ data.reduce { (i1,i2) => i1 + i2 }
data.reduce { _ + _ }
{% endhighlight %}
+<a name="rich-functions"></a>
+
## Rich functions
-All transformations that take as argument a lambda function can
-instead take as argument a *rich* function. For example, instead of
+所有将 lambda 表达式作为参数的转化操作都可以用 *rich* function 来代替。例如，代替
{% highlight scala %}
data.map { x => x.toInt }
{% endhighlight %}
-you can write
+你可以写成
{% highlight scala %}
class MyMapFunction extends RichMapFunction[String, Int] {
def map(in: String):Int = { in.toInt }
};
{% endhighlight %}
-and pass the function to a `map` transformation:
+并将函数传递给 `map` transformation:
{% highlight scala %}
data.map(new MyMapFunction())
{% endhighlight %}
-Rich functions can also be defined as an anonymous class:
+富函数也可以定义成匿名类:
Review comment:
yes，it's should be resvered as `function`
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