They also analyse the principle and method for determining both shot hole depth and instrument factors.
探讨了井深和仪器因素的选取原则及方法；
The lights were all so small and unobtrusive that they were never in shot, so Ryan could just drive around while Tony played the roof rack like a musical instrument.
那些灯都很小而且一点都不会对画面形成干扰，这样高司令就只要管开车四处走就行了，而Tony则会像演奏乐器一样的操作顶棚的灯架。
The magnetic survey instrument is similar to the tool used in a single-shot survey except that camera is a modified movie camera that takes pictures every 15-20 seconds.
磁性测量仪器与单点测量所用的下井仪类似，不过它使用的摄影机是一种改造过的电影摄影机。每15~20秒钟可以照相一次。
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