Markdown 语法指南

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# H1 标题
## H2 标题
### H3 标题
#### H4 标题
##### H5 标题
###### H6 标题

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def hello_world():
    """打印 Hello World"""
    print("Hello, World!")

    # 计算斐波那契数列
    def fibonacci(n):
        if n <= 1:
            return n
        return fibonacci(n-1) + fibonacci(n-2)

    print(f"Fibonacci(10) = {fibonacci(10)}")

if __name__ == "__main__":
    hello_world()

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// ES6 箭头函数
const greet = (name) => {
  console.log(`Hello, ${name}!`);
};

// 异步函数
async function fetchData(url) {
  try {
    const response = await fetch(url);
    const data = await response.json();
    return data;
  } catch (error) {
    console.error('Error:', error);
  }
}

greet('World');

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package main

import (
    "fmt"
    "time"
)

func main() {
    // 并发执行
    ch := make(chan string)

    go func() {
        time.Sleep(1 * time.Second)
        ch <- "Hello from goroutine!"
    }()

    msg := <-ch
    fmt.Println(msg)
}

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![图片描述](图片URL)