Motion across the line of sight can be followed by direct observation.
与视线垂直的运动可以通过直接观测得到。
During transmission line construction, sag observation is an important control item of stringing.
在输电线路施工中，弧垂观测是架线分部工程中重要的控制项目。
During transmission line construction, sag observation is an important control item of stringing.
在输电线路施工中，弧垂观测是架线分部工程中重要的控制项目。
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