Taking care of validation phase probably belongs to the second context.

一般在第二种情况中才需要认真处理验证阶段。

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Listing 2 shows you how to handle the validation phase (with some code omitted for clarity).

清单2显示了如何处理验证阶段(为了保持简洁，省略了一些代码)。

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In contrast to the validation phase, the measurement phase must happen in bottom-up fashion.

与验证阶段相反，度量阶段是自下而上的。

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The first four Galileo satellites comprise the so-called In-Orbit Validation (IOV) phase of the project.

BBC: Galileo: Europe's version of GPS reaches key phase