Defining this model is the necessary intermediary step between the concept stage and implementation stage.

对模型进行定义是概念阶段和实现阶段之间的必要中间步骤。

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This stage prepares the necessary data structures that represent fields, methods, and implemented interfaces that are defined within each class.

这个阶段准备代表每个类中定义的字段、方法和实现接口所必需的数据结构。

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Of the roughly 26 million people living with HIV in Africa, an estimated 4 million have advanced to the stage where the drugs are necessary to forestall the onset of AIDS.

在非洲，大约有2600万人感染了艾滋病病毒，估计其中有400万人已经进入需要用药物阻止艾滋病发作的阶段。

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It is also true that he has been key to the necessary back-stage dealings between the Scottish and UK governments.

BBC: Shaking it up

All sides should take this holiday period to reflect on what they can do to build the confidence necessary to move forward to the next stage.

BBC: May (2): Mo Mowlam

But she said the amendment was not necessary "at this stage" and appealed for it to be withdrawn.

BBC: Ex-prisons chief: Prison is failing young offenders