A white North American swan (Olor columbianus) having a soft, musical trumpeting voice and a black beak with a yellow spot at the base.

一种白色北美洲天鹅（哨声天鹅或小天鹅天鹅属） 有柔和、充满乐感的象喇叭似的嗓音，黑喙，底部带有一黄点。

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Any of various large aquatic birds of the family Anatidae chiefly of the genera Cygnus and Olor, having webbed feet, a long slender neck, and usually white plumage.

天鹅：鸭科的各种大型水禽，主要是天鹅和哑天鹅属，有蹼足、长而细的脖子和通常为白色的羽毛。

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Any of various large aquatic birds of the family Anatidae chiefly of the genera Cygnus and Olor, having webbed feet, a long slender neck, and usually white plumage.

天鹅：鸭科的各种大型水禽，主要是天鹅和哑天鹅属，有蹼足、长而细的脖子和通常为白色的羽毛。

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