Hesperornis is an extinct genus of flightless aquatic birds that lived during the Late Cretaceous.
黄昏鸟是一种已经灭绝的不会飞翔的水鸟，生活在白垩纪晚
。
Hesperornis is an extinct genus of flightless aquatic birds that lived during the Late Cretaceous.
黄昏鸟是一种已经灭绝的不会飞翔的水鸟，生活在白垩纪晚。
：以上例句、词性分类均
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