Some are not, but many of these are even supported through abstraction classes or extensions.

一些RDBMS不支持PHP，但是很多这样的RDBMS可以通过抽象类或扩展来提供PHP支持。

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WebSphere Portal is a framework that lets you plug in new features or extensions called portlets.

WebSphere Portal是一个框架，允许添加称为portlet的新特性或扩展。

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If the product elements (or extensions) are dynamic or volatile and may change over time, then specs is a good option.

如果产品类型(或扩展)是动态或经常变化的，并且可能随时间变化，那么specs是最佳选择。

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No renegotiations or extensions of the rookie contract until after three years of the contract.

FORBES: One Area Of Agreement In NFL Labor Dispute: Take Money From The Rookies

The present rule allows for renegotiations or extensions after two years of rookie contracts.

FORBES: One Area Of Agreement In NFL Labor Dispute: Take Money From The Rookies

Awards can be small and mid-sized , in the form of cash or extensions on student loans.

FORBES: CENGAs and A Plea for Private Equity Now