1·A trumpeter swan glides across the surface of the Yellowstone River.
一只号手天鹅正游过黄石河的水面。
2·The whooper swan, like its onomatopoeic Cousins, the whistling and the trumpeter, belongs to an elegant society of sisters; the mute, Bewick's, black, and black-necked fill out the ranks.
大天鹅与它们喜欢唱歌的表姊妹小天鹅和号手天鹅同属一个体态优雅的鸟类大家庭；而不唱歌的比尤伊克天鹅、黑天鹅和黑颈天鹅也是这个家族的成员。