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首先，看下效果，就是下面这样（RSS 订阅用户可能看不到效果，请点击查看原文)：
```
{{< mermaid >}}
sequenceDiagram
participant Alice
participant Bob
Alice->>John: Hello John, how are you?
loop Healthcheck
John->John: Fight against hypochondria
end
Note right of John: Rational thoughts prevail...
John-->Alice: Great!
...