The system themes provide a solid foundation on top of which you can selectively implement your own visual stylings.

系统的主题提供了一个坚实的基础，在这个基础上你可以有选择地实现你自己的视觉风格。

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Themes and skins are a major plug point in the portal system, in which you can influence the complete portal page look-and-feel.

主题和皮肤是门户系统中的主要插接点，您可以在其中修改整个门户页面的外观。

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So, the model themes are governed by the nature of the system, including the system purpose and goals.

因此，模型主题由系统的本质所决定，包括系统用途和目标。

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Taxes are a worldwide phenomenon, and although every system is different, there are many consistent themes.

FORBES: Why A Hot Sandwich Is Taxable But A Cold One Is Not