You may choose any item from a particular floor, or may choose to go up to the next floor, but you CANNOT go back down except to exit the building.
你可以在任何一层选择任意商品，你也可以选择登上下一层，但是，你不能往回走，除非你要离开商店。
Start with the item farthest back and work up to the present.
启动该项目，最远回来工作，目前为止。
Start with the item farthest back and work up to the present.
启动该项目，最远回来工作，目前为止。
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