Do take note that account level upgrade payments are non refundable.

请注意提升付款是不退款的。

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To perform a feature level upgrade, see Changing the feature level and metaschema version.

您可以查看变更特性级别及metaschema版本，以执行一次Feature Level升级。

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You may also want to develop a high-level upgrade plan that you fine-tune as you move through the remaining stages.

您可能还希望开发高级升级计划，可在之后的阶段中对其进行调整。

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"To get back to the 1998 level of production, Venezuela would need to invest for the next 10 years to upgrade its petroleum operations.

VOA: standard.2010.08.06

With three DLC releases out already, should at least this latest one been packaged with a level cap upgrade?

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You can upgrade to a premium level for the holiday season and then go back down to free.

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On a literal level, the iPhone 5 is an upgrade.

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