目前的平衡两层次样本轮换模式只适用于一级单元规模较小时的两阶段抽样月度调查。

The present balanced two-layer sample rotation system is applicable only to the monthly survey with two-stage sample designs and with small primary sampling units.

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单元测试必须作为一级应用程序代码管理。

Unit tests must be managed as first-class application code.

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第一级包括性能对象，它是可以为物理设备建模，或者抽象系统中组件的单元。

The first level consists of the performance object, which is a unit that can model a physical device or abstract component in a system.

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