但在实际上，要测量这些时间和距离，达到所需要的检测到纳秒级别差异的准确度，绝非易事。
But actually measuring those times and distances to the accuracy needed to detect nanosecond differences is no easy task.
要真正有效地使用它，需要对时间是如何测量的多少有一些了解。
To really apply it effectively is going to require some understanding of how time is being measured.
因为您不知道编译器什么时候执行，也不知道要执行多长时间，所以您可以看到，您的测量可能受到严重的歪曲。
Because you don't know when the compiler will run or for how long, you can see how your measurements could be badly distorted.
要测量数据的“更新程度”，您可能决定向该对象添加时间戳记字段，以便容易地检测对象是否与后备存储器同步。
To gauge the "freshness" of the data, you might decide to add a timestamp field to the object so that you could easily detect whether the object and the backing store were out of sync.
不过这可能还需要一段时间，因为他目前正在为2010年展会的项目而忙碌，这次他要设计一个可以通过测量电磁场变化来搜索地下河的装置。
That will have to wait, though, because he's busy working on his 2010 science fair project - a device that finds underground rivers by measuring their electromagnetic currents.
虽然本书的重点是直流测量，但是要分析噪声和仪器响应速度的问题，就需要简单地讨论一下电子电路中时间和频率的关系。
Although this handbook stresses DC measurements, an analysis of noise and instrument response speed requires a brief discussion of time and frequency relationships in electronic circuits.
然而，要记住这种滤波功能可能会带来其它有害的作用，诸如增加了测量的响应时间等。
Keep in mind, however, that such filtering may have other detrimental effects, such as increased response time on the measurement.
在继电器被闭合后，在进行测量之前要留有足够的稳定时间，这点非常重要。
After a relay is closed, it's important to allow sufficient settling time before taking a measurement.
实际测量结果表明，在网络延迟方面，二级时间服务器要优于一级时间服务器。
Practical measurements result shows that secondary time server are better than primary ones from the perspectives of network delay.
每当我要测量员工操作周期时间时，我就会马上发现他们的动作突然慢下来，就像慢动作电影。
Whenever I was approaching them for timing the cycle time I quickly found out that their motion suddenly become slows, like the slow motion movie.
基于时空坐标转换理论而研制的时栅位移传感器实现了以时间测量空间，但关键是要构建一个以恒速V运动的坐标系。
Time grating displacement sensor is working on theory of time-space coordinate transformation, which need constitute a moving coordinate with constant velocity V.
到一个新的金矿区或者各种资料比较混乱的金矿区如何理顺思路并在短时间内迅速有效地开展控制测量工作，是黄金地质测量工作者要着重解决的问题。
How to carry out control survey rapidly and effectively in a new or data confused gold mining area is an important problem for gold geological surveyors to resolve.
到一个新的金矿区或者各种资料比较混乱的金矿区如何理顺思路并在短时间内迅速有效地开展控制测量工作，是黄金地质测量工作者要着重解决的问题。
How to carry out control survey rapidly and effectively in a new or data confused gold mining area is an important problem for gold geological surveyors to resolve.
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