如何向此事件添加冷却时间或ratelimit？discord.py

from discord.ext import commands

bot = commands.Bot(command_prefix='!')

@bot.event
@commands.cooldown(1, 60, commands.BucketType.user)
async def on_message(message):
    # 在此处添加事件处理逻辑
    await bot.process_commands(message)

@bot.command()
@commands.cooldown(1, 60, commands.BucketType.user)
async def my_command(ctx):
    # 在此处添加命令处理逻辑
    await ctx.send('Hello, World!')

bot.run('YOUR_BOT_TOKEN')