采用编码器测量行程，计算并显示带卷直径，保证带卷对推开卷机卷筒中心。

Using encoder to measure stroke, to do calculation to display coil diameter so that the coil can be guaranteed to align with the centre of uncoiler barrel.

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而保险公司，如美国的Progressive公司和英国的Coverbox都要求顾客在车上安装可以测量行程，时速，和地点的设备。

And insurance firms, among them Progressive in America and Coverbox in Britain, ask customers to install equipment in their cars that can measure for how long, how fast and even where a car is driven.

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同步覆盖：在单元测试中极力推荐测量代码覆盖，但是在测试并行程序时使用它，代码覆盖容易产生误导。

Synchronization coverage: Measuring code coverage is a highly recommended practice in unit testing, but when it comes to concurrent programs, code coverage is misleading.

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