He adjusted the instrument for a clear backsight.

他调整了仪器以获得清晰的后视。

The accuracy of the survey depends on a precise backsight.

测量的准确性取决于精确的后视。

A proper backsight is crucial for reliable survey results.

正确的后视对于可靠的测量结果至关重要。

Always perform a backsight before proceeding with the next measurement.

在进行下一次测量之前，总是要进行后视。

The surveyor took a backsight to ensure the measurements were accurate.

测量员进行了后视以确保测量的准确性。