研究说明陀螺经纬仪的使用，可以减少地下导线测量的误差传播。
Study proves that use of gyroscopic theodolite can decrease the error propagation in the underground traverses survey.
我们假定导线是完全绝缘的，没有丝毫电流漏入地下。
We assume that the cables are perfectly insulated and that there is no loss of current to the ground.
补偿导线最好在地下管道中穿过。
It is desirable that compensating cables be run in earthed conduit.
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