| 单词 | range ring |
| 释义 | > as lemmasrange ring range ring n. Radar each of a set of concentric circles on a radar screen that correspond to known target distances; cf. range marker n. 4. ΚΠ 1949 E. M. Robb Applic. Radar to Seamanship & Marine Navigation 30 (caption) To make the range circles and heading marker look more like themselves, they have been retouched in this photograph.] 1950 L. M. Orman Electronic Navigation Gloss. 203 Range ring, accurate adjustable ranging mark on PPI. 1991 Motor Boat & Yachting Jan. 103/3 The VRM is an adjustable range ring, whose distance from the centre of the screen can be varied by the operator. < as lemmas |
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