| 单词 | whistling swan |
| 释义 | whis·tling swan (wĭslĭng, hwĭs-) n. A subspecies (Cygnus columbianus subsp. columbianus) of the tundra swan found in North America and having a clear, honking call and a black beak with a yellow spot at the base. [Named by Meriwether Lewis after its call, the first part of which reminded him of whistling.] |
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