This is a test repsitory for learning and practice on how to use github
```mermaid
flowchart TD
A[需求调研与收集] --> B[运能运量测算与基础条件核查]
B --> C[制定初步开行方案]
C --> D[方案内部论证与优化]
D --> E[外部征求意见]
E --> F[方案审批]
F --> G[发布实施]
G --> H[跟踪评估与动态调整]
```
## 更复杂的流程图
```mermaid
flowchart TD
subgraph 虚框组1
direction TB
A[需求调研与收集]
B[运能运量测算与基础条件核查]
C[制定初步开行方案]
end
style 虚框组1 stroke-dasharray: 5 5
subgraph 虚框组2
direction TB
D[方案内部论证与优化]
E[外部征求意见]
F[方案审批]
end
style 虚框组2 stroke-dasharray: 5 5
A --> B
B --> C
C -- 开行方案 --> D
D --> E
E --> F