| 单词 | radar echo |
| 释义 | > as lemmasradar echo radar echo n. ΚΠ 1945 Nature 15 Sept. 319/2 The end or ‘trailing edge’ [of the pulse] marks the beginning of an invaluable clear period in which the radar echoes..can be received free from the overlaying and interfering effect of the primary signal. 1962 F. I. Ordway et al. Basic Astronautics iii. 65 The first radar echoes were returned from the Moon in 1946. 2007 Atmospheric Res. 83 158/1 The first CG [= cloud to ground] lightning took place between 20 and 25 min after the first significant radar echo. < as lemmas |
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