说明： Pre-review checklist 准备工作
2.1Practical considerations 通常的考虑
1. Have you been provided with a design document to understand the code ? Is the design document up-to-date (latest version) ? 你是否得到一份解释代码的设计文档？设计文档是否最新的？
2. Does the design document explain 设计文档是否做了如下解释：
