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段落翻译（手写拍照上传）：They function by sending light waves or microwaves along the path to be measured and measuring the time differences between transmitted and received signals, or in measuring the phase differences between transmitted and received signals in returning the reflecting light wave to source.

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段落翻译（手写拍照上传）：Modern EDM instruments are fully automatic to such an extent that, after the instruments, set up on one station, emits a modulated light beam to a passive reflector set up on the other end of the line to be measured. The operator need only depress a button, and the slope distance is automatically displayed.

What are EDM instruments?（用英语回答，手写拍照上传）

What is the basic principle of EDM instruments?（用英语回答，手写拍照上传）

单词互译：geodetic surveying：()平面测量，平面测量学：()控制测量：()vertical survey：()地形测量：()碎部测量：()