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。

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Specifically, the user groups and the back-end item database for that List are not cleaned up.

具体来说，将不会清除掉该List的用户组和后端项数据库。

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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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