1.【动】平胸类 (Ratitae) 的,无龙骨的
1.平胸类鸟
1.a flightless bird such as an ostrich or emu that has a flat breastbone without the ridge-shaped part to which the flight muscles are attached in a flying bird
1.But the ratite family, from large ostriches to small kiwis, were thought to be the exception to this rule.
但大至鸵鸟小至几维鸟的走鸟家族却被认为是例外。
2.a ratite bird order: birds intermediate in characteristics between ostriches and emus: recent and extinct rheas .
平胸类鸟目之一；介于鸵鸟与鸸鹋之间；近来灭绝的美洲鸵。
3.a ratite bird order: flightless ground birds having vestigial wings and long bills and small eyes: kiwis.
一种平胸鸟目；小眼睛长嘴且翅膀已退化的不会飞的鸟类几维。
4.a ratite bird order: ostriches and related extinct birds; known from the Pleistocene onward.
平胸鸟目之一；鸵鸟及与其有关的现已灭绝的鸟类；生活于洪积世以前。
5.a ratite bird order: recently extinct flightless birds of New Zealand.
平胸鸟目；产于新西兰最近灭绝的不会飞的鸟类。
6.heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds.
南美体重翼小的猎鸟，形似鹌鹑但与平胸鸟有亲缘。
7.A ratite bird, such as the ostrich or emu.
平胸鸟平胸鸟，如鸵鸟和鹤鸵
8.Development and Use of Ratite Grease
平胸类鸟油的开发与利用