In testing the dynamics performance of locomotives and rolling stock on the roller testing rig, the difference between the track wheel and the actual track may cause deviation of the test results.

滚动振动试验台在测试机车车辆动力学性能时，轨道轮与实际线路的差异会造成测试结果出现偏差。

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Rather than buy a product outright, or sign a long-term service contract, sensors can track actual usage, enabling customers to pay only for what they consume or even the value they receive.

不同于一次性购买或签订长期服务合同，传感器可以跟踪实际使用情况，允许顾客根据自己的消费内容甚至得到的价值进行支付。

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We expect these percentages to change over the course of our implementation and maturity level, and will track the changes with our actual measurements as we progress.

我们期待在我们提高成熟度等级后，这些百分比将会变化，我们在执行中将进行实际度量。

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This helps sales managers to track actual sales activity and compare different sales people.

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The technology used by Facebook and other social media websites track actual PERSONAL data, and not just location.

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While there are plausible theoretical reasons why such measures might work, in actual practice the track record of fiscal stimulus shows very little bang for the buck.

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