您可以使用 Client.get_emoji 来获取 Emoji 对象，然后使用它来构建您的字符串

You can use Client.get_emoji to get the Emoji object, then use that to build your string

@bot.command()
async def say(ctx, *, text):
    ono = bot.get_emoji(521148278079881219)
    await ctx.send(f"{ono} You said {text}")