Before unit testing is finished, developers can specify a promotion level for the build, with REJECTED obviously being one of the choices.

在基本单元测试完成之前，开发者可以为这个构建指定一个晋升水平，当然也有可能被否决。

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The arguments above specify an expression that yields a boolean value and a block of code that returns nothing (Unit), which is exactly what while expects.

上述语句指定了一个表达式，该表达式产生了一个布尔值和一个不返回任何结果的代码块（Unit），这正是 while 所期望的。

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Optionally, a unit may also specify its install state for the purposes of deployment as unknown, installed, or not_installed.

有时可以视情况而定，一个单元可能还可以根据不同的部署目的将它的安装状态指定为 unknown， installed，或者 not_installed。

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