GPS接收机的校正可以对这方面的误差做出解释，但尽管如此，GPS时钟信号只能保证准确度为100纳秒的级别。
GPS receivers make corrections to account for this, but nonetheless the clock signals are only guaranteed to be correct on the order of 100 nanoseconds.
通常情况下，医生在对病人进行激光眼科校正手术时使用视频摄像机来跟踪眼球的转动，以便使激光手术刀落在正确的地方。
Normally when patients undergo corrective laser eye surgery, surgeons use video cameras to track the position of the eye so that the surgical laser targets the right place on the cornea.
有了这些小摄像机，就不需要像以往一样，为测定演员的面部表情而煞费苦心地校正他们的肢体动作了。
The lipstick cameras meant it was not necessary to perform the laborious task of compensating for the actors’ bodily movements in order to determine their facial expressions, as is usually the case.
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