如何取消由python-trio中的托儿所产生的特定任务

import trio
from trio._core._run import Nursery

async def task1():
    # 任务1的代码

async def task2():
    # 任务2的代码

async def main():
    async with Nursery() as nursery:
        nursery.start_soon(task1)
        nursery.start_soon(task2)

async def cancel_task(nursery: Nursery, task: trio.Task):
    nursery.cancel_scope.cancel()

async def main():
    async with Nursery() as nursery:
        task1 = nursery.start_soon(task1)
        task2 = nursery.start_soon(task2)

        # 取消任务1
        await cancel_task(nursery, task1)