| 单词 | Cygnus columbianus columbianus |
| 释义 | Cygnus columbianus columbianus (extremely rare) n WORD FAMILY Cygnus columbianus columbianus n North American subspecies of tundra swan having a soft whistling note Syn|Hyper whistling swan Cygnus columbianus, tundra swan swan that nests in tundra regions of the New and Old Worlds |
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