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Update rocketmq-questions.md
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docs/high-performance/message-queue/rocketmq-questions.md
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@ -348,7 +348,7 @@ emmm，就两个字—— **幂等** 。在编程中一个*幂等* 操作的特
![](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-11/16ef387d939ab66d.jpg)
## 什么事回溯消费？
## 什么是回溯消费？
回溯消费是指 `Consumer` 已经消费成功的消息，由于业务上需求需要重新消费，在`RocketMQ` 中， `Broker` 在向`Consumer` 投递成功消息后，**消息仍然需要保留** 。并且重新消费一般是按照时间维度，例如由于 `Consumer` 系统故障，恢复后需要重新消费 1 小时前的数据，那么 `Broker` 要提供一种机制，可以按照时间维度来回退消费进度。`RocketMQ` 支持按照时间回溯消费，时间维度精确到毫秒。