如何在python中的check按钮点击前继续播放声音文件？

import threading
import time
from playsound import playsound
from tkinter import Tk, Checkbutton, Button, Label

def play_sound():
    playsound('audio_file.mp3')  # 替换为你要播放的声音文件路径

def check_button_clicked():
    global sound_thread

    if sound_thread is None or not sound_thread.is_alive():
        sound_thread = threading.Thread(target=play_sound)
        sound_thread.start()

def main():
    global sound_thread

    sound_thread = None

    root = Tk()
    root.title("Play Sound")
    root.geometry("200x100")

    check_button = Checkbutton(root, text="Play Sound", command=check_button_clicked)
    check_button.pack()

    stop_button = Button(root, text="Stop Sound", command=root.destroy)
    stop_button.pack()

    label = Label(root, text="Click the check button to play sound.")
    label.pack()

    root.mainloop()

if __name__ == "__main__":
    main()