我们应该在卖掉房子之前把前门修好。
T 平整，翠绿的草坪，蓝白相间的绣球花整齐的摆在房子一侧，前门的另一侧是主人最爱的盆栽植物。
Tidy green lawn with blue and white hydrangeas lining the house. Favourite potted plants on either side of the front door.
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.
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