中国人用重力仪来校正海平面的局部偏差。
The Chinese used a gravity meter to correct for local deviations in sea level.
简单地说，陀飞轮就是为了校正重力对精度的影响。
Tourbillons (in the most basic terms) prevent gravity from adversely affecting accuracy.
为此，应当不做“中间层校正”，而应代之采用自由空气重力异常加上“地形趋势面校正”之结果，以形成地形趋势面自由空气重力异常。
So, instead of'intermediate layer correction', we should adopt free air gravity anomaly and'topographic trend surface correction', which result in topographic trend surface free air gravity anomaly.
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