单词 | Bewick's swan |
释义 | Bewick's swan (once / 844237 pages) n WORD FAMILY Bewick's swan USAGE EXAMPLESShe is following the migratory route of the Bewick's swan in an attempt to understand why their numbers have halved in the past two decades. BBC(Sep 27, 2016) Ornithologists are also still trying to find out why the northwest Europe Bewick's swan population has been in dramatic decline. BBC(Dec 24, 2012) "We still need to find out what is driving down Bewick's swan numbers," said Ms Newth. BBC(Dec 24, 2012) n Eurasian subspecies of tundra swan; smaller than the whooper Syn|Hyper Cygnus columbianus bewickii Cygnus columbianus, tundra swan swan that nests in tundra regions of the New and Old Worlds |
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