| 单词 | plan position indicator |
| 释义 | plan position indicatornouna radarscope on which an object reflecting radar waves shows its bearing and distance from the radar detector by causing a spot of light to appear on a screen that represents a map of the area around the detector. Abbreviation: PPI Origin of plan position indicatorFirst recorded in 1940–45 Words nearby plan position indicatorplanometer, plan on, planosol, planospore, planovalgus, plan position indicator, plansheer, plant, planta, Plantae, Plantagenet Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 |
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