使测量人员能够在测量出问题时，能快速的从初始位重新开始测量。

So surveyor can restart measurement quickly, if some problems appear in any time.

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据测量人员检测，钟楼顶部已水平偏移1.5英尺(约0.46米)，而且情况逐年严重。

The top of the clock tower is leaning one-and-a-half feet off a level position, according to surveyors, and getting worse each year.

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后来，其他研究人员测量了密度差，发现了一个显著的差异。

Later, other researchers measured the density differential and found a significant difference.

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