导线测量是一项精密而细致的工作，直接影响到路线的定线和高程系统的控制。
The orientation measurement is a precise and detailed job, and it affects directly the route alignment and the control of elevation system.
导线测量是一项精密而细致的工作，直接影响到路线的定线和高程系统的控制。
The orientation measurement is a precise and detailed job, and it affects directly the route alignment and the control of elevation system.
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