简而言之，衡量国家经济福祉的核心指标就像一台计算器，只能增加，不能减少。

In short, the nation's central measure of economic well-being works like a calculating machine that adds but cannot subtract.

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经过多次试验和反复补充修改设计，最终制成了一台具有较高性能指标的高压开关电源样机。

After many times tests and modifying design, a sample machine of switch high voltage power supply with high performance index is finished.

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介绍了“北京交通大学-NTN牵引电机轴承试验站”试验台的功能、性能指标以及各主要组成部分的结构与原理。

The functions, performance index, configurations and principles of the main modules of the "BJTU-NTN test station of traction motor bearing" were introduced.

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