快递公司搞混了两个包裹，导致我们的东西送错了地址。

There was a ___mix-up with the packages, so our items were delivered to the wrong address.

机场行李传送带上的包裹搞混了，导致很多人拿错了行李。

There was a ___mix-up with the luggage on the airport conveyor belt, causing many people to take the wrong bags.