liyubin117 commented on a change in pull request #12442:
URL: https://github.com/apache/flink/pull/12442#discussion_r440120853
##########
File path: docs/dev/event_time.zh.md
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@@ -24,40 +24,22 @@ specific language governing permissions and limitations
under the License.
-->
-In this section you will learn about writing time-aware Flink programs. Please
-take a look at [Timely Stream Processing]({% link
-concepts/timely-stream-processing.zh.md %}) to learn about the concepts behind
-timely stream processing.
+本节你将学到如何写可感知时间变化的 Flink 程序，可以先看看[实时流处理]({% link
concepts/timely-stream-processing.zh.md %})了解相关概念。
-For information about how to use time in Flink programs refer to
-[windowing]({% link dev/stream/operators/windows.zh.md %}) and
-[ProcessFunction]({% link
-dev/stream/operators/process_function.zh.md %}).
+想了解如何在 Flink 程序中使用时间特性，请参阅[窗口]({% link dev/stream/operators/windows.zh.md
%})和[处理函数]({% link dev/stream/operators/process_function.zh.md %})。
-* toc
-{:toc}
+使用*事件时间*进行流处理的先决条件是设置合适的*时间特性*，该设置定义了数据流的行为方式（例如，是否分配时间戳），以及窗口算子使用哪种时间概念，例如
`KeyedStream.timeWindow(Time.seconds(30))` 。
Review comment:
@klion26 非常中肯的建议！分两步的commit已经提交了，麻烦看一下 :)
有个细节想问一下，这个hotfix commit是提jira然后建另一个pr吗？
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