swan [swɒn]

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n.天鹅；vi.闲荡，游荡

a large usually white bird with a long neck that lives on rivers and lakes

A swan has white feathers and a long thin neck. 天鹅长着白色的羽毛和长而细的脖子。
Swan Lake is the name of a famous ballet. 天鹅湖是一出著名的芭蕾舞剧。