| 单词 | recognition signal |
| 释义 | Definition of recognition signal in English:recognition signalnoun Military
OriginMid 19th century; earliest use found in Richard Townsend (1821–1884), mathematician. Definition of recognition signal in US English:recognition signalnoun Military
OriginMid 19th century; earliest use found in Richard Townsend (1821–1884), mathematician. |
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