Hesperornis is an extinct genus of flightless aquatic birds that lived during the Late Cretaceous.
黄昏
是一种已经灭绝
不会飞翔
，生活在白垩纪晚期。
Hesperornis is an extinct genus of flightless aquatic birds that lived during the Late Cretaceous.
黄昏是一种已经灭绝不会飞翔，生活在白垩纪晚期。
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