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平胸鸟的与一种平胸,没有一般飞翔性鸟类所特有的龙骨状突起的不会飞的鸟有关的;
Relating to or being any of a group of flightless birds having a flat breastbone without the keellike prominence characteristic of most flying birds.
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象脊或龙骨的,有脊或龙骨的;成脊状突起的。
Shaped like or having a carina or keel; ridged.
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