我们应该在卖掉房子之前把前门修好。

We should fix the front door before we sell the house.

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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.

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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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