The pilar difference measurement and instrument comparison is basic to the quality and usage of the recorded geomagnetic data.

墩差测量和仪器比测是地磁观测中最基本的工作，直接影响到观测资料的质量和使用价值。

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Comparison between a current share price, portfolio of shares or a stock index and the price of the same instrument, portfolio or index at a given time in the past.

指股票的现行价格、股票组合或某种股指，与过去某一时刻相同金融工具的价格、组合或指数间的比较。

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To cultivate the right instrument of perception there must be no comparison for when you compare you cease to understand.

为了培养正确的觉知工具，不能比较。因为当你比较时，你就不在理解了。

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