此外，如果你买了摩托罗拉xoom，它承诺未来会免费提供4g的升级。
Also, if you buy a Motorola Xoom, it comes with the promise of a free future 4g upgrade.
作为基础设施建设承诺的一部分，我们还需要对数字高速公路进行升级。
As part of this commitment to infrastructure, we need to upgrade our digital superhighway as well.
在我写作本文时，发布了它的当前版本1.4；所以我马上进行了升级，以利用它所承诺的更快速度。
It's current version 1.4 was released as I was writing this article; so I upgraded immediately to take advantage of the promised more speed.
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