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| 单词 | echo-plummet |
| 释义 | > as lemmasecho-plummet echo-plummet n. [ 1d] a radio sounder for measuring height above ground level or the depth of water in the sea. ΚΠ 1931 Flight 27 Mar. 274/2 The echo-plummet used extensively for maritime navigation seems to encounter certain difficulties in aeroplanes. 1933 Discovery Oct. 307/1 The well known acoustic echo plummet which is employed in measuring ocean depths. < as lemmas |
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