package main

import (
    "fmt"
    "time"
)

func sayHello() {
    for i := 0; i < 5; i++ {
        time.Sleep(100 * time.Millisecond)
  探究Golang的核心功能和应用领域有哪些？       fmt.Println("Hello")
    }
}

func sayWorld() {
    for i := 0; i < 5; i++ {
        time.Sleep(200 * time.Millisecond)
        fmt.Println("World")
    }
}

func main() {
    go sayHello()
    go sayWorld()

    time.Sleep(1 * time.Second)
}