Using the analogy of a house to represent the system, you decide to carve out a piece of your front door to give your pets' easy access to the outdoors.
我们可以使用房子来代表该系统，您想要在前门上开出一小块作为您的宠物的通道。
Using the analogy of a house to represent the system, you decide to carve out a piece of your front door to give your pets' easy access to the outdoors.
我们可以使用房子来代表该系统，您想要在前门上开出一小块作为您的宠物的通道。
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