现场经常使用的测量标记或临时基点、基标要定期复核。

The survey mark temporary base point and fiducial mark frequently used at the site shall be regularly re-checked.

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这些点是标记，使他们能够测量花朵从萌芽到开花的每一次大小和形状的变化。

These dots were markers that enabled them to measure every change in the size and shape of the flower as it went from bud to bloom.

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测量员从海岸向内陆行进数千英里，每增加几英尺就停下来测量海拔，每增加一英尺就用两根杆子做标记。

Surveyors marched inland from the coast for thousands of miles, stopping at increments of as little as a few feet to measure their elevation, and marking each increment with two poles.

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So what we do is we pick an origin, call it zero, we put some markers there to measure distance, and we say this guy is sitting at 1,2,3,4,5.

我们现在选择一个原点,称其为零点,我们做一些标记来测量距离,这个点在五个单位长度的地方

耶鲁公开课 - 基础物理课程节选