而且内饰可以随时升级为皮革质地。

And you can always upgrade to leather upholstery.

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这个结构能够随时升级，比如增加墙体或者金属屋顶。

The structure could be upgraded over time, for example by adding earth walls or a metal roof.

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用户可通过参加我们的任何收费服务随时升级为高级用户。

Users may upgrade their account to premium status at any time by signing up for any of our paid services.

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