请按照 [审核标准](https://github.com/pingcap-incubator/tidb-in-action/blob/master/README.md) 审核以下章节： [第二部分 1.2.1 TiDB Operator 简介及原理](https://github.com/pingcap-incubator/tidb-in-action/blob/master/session2/chapter1/tidb-operator-intro.md)
