As a consequence of the drift of inclinometer's mechanicalness and electrical circuit during the long-dated observation, the lattice value of the inclinometer's record trunk must be calibrated termly.

在长期的观测过程中，仪器机械部分和电路部分均会产生漂移，因此，仪器记录曲线的格值必须定期进行标定。

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But it makes a big difference to the value of long-dated options.

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