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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地震前兆数据采集器是数字化地震前兆台站的关键性设备之一，其指标、性能对前兆观测数据质量有重要影响。

The acquisition system of earthquake precursor data is one of the key devices for digital earthquake precursor station, its technical target and property have important influence on data quality.

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