自动回复系统的工作原理是怎样的？

import time
import random
from tkinter import *
def auto_reply(message):
    replies = [
        "你好！",
        "很高兴见到你！",
        "请问有什么可以帮助你的？",
        "谢谢你的提问！",
        "祝你有个美好的一天！",
    ]
    return random.choice(replies)
def send_message():
    message = entry.get()
    if message:
        chat_history.insert(END, "你： " + message + "
")
        entry.delete(0, END)
        reply = auto_reply(message)
        chat_history.insert(END, "机器人： " + reply + "
")
root = Tk()
root.title("自动回复聊天机器人")
chat_history = Text(root, wrap=WORD, width=50, height=10)
chat_history.pack(padx=10, pady=10)
entry = Entry(root, width=50)
entry.pack(padx=10, pady=10)
send_button = Button(root, text="发送", command=send_message)
send_button.pack(padx=10, pady=10)
root.mainloop()