| 释义 |
plunge a grade
phrasal
1. : to establish a grade between two points of known level by sighting a target set up at either point through a theodolite fixed at the other point, clamping the instrument, and then bringing the target into the fixed line of sight at any desired intermediate points on the grade — compare bone II 4
2. : to test (as a railroad embankment) as to its reliability or condition by prodding with a light pointed steel rod |