大家都搜：
原始哺乳动物
1、granivorous mammals───粒状哺乳动物
2、primitive skateboards───原始滑板
3、primitive───n.原始人；adj.原始的，远古的；简单的，粗糙的
4、primitive survival───原始生存
5、primitive gatherings───原始集会
6、amniota mammals───羊膜哺乳动物
7、primitive urge───原始冲动
8、primitive response───原始反应
9、mammals───n.[古生]哺乳类；哺乳类动物（mammal的复数）；哺乳纲
1、archaic forms of life; primitive mammals; the okapi is a short-necked primitive cousin of the giraffe.───原始的生命形式；原始哺乳动物；短颈的俄卡皮鹿是长颈鹿的原始近亲。
2、These primitive mammals were tiny and are thought to have been nocturnal.───这些原始哺乳动物是微小的和被认为是夜的。
3、Now is the world's most primitive mammals.───是现在世界上最原始的哺乳动物。
4、Mammals arose from a fairly primitive reptile in the Mesozoic era.───哺乳类起源于中生代宛若原始的爬虫类。
5、Many primitive lineages went extinct as sharks and bony fish became masters of the waters and tetrapods, the four-legged animals that eventually evolved into dinosaurs and mammals, conquered the land.───许多原始生物灭绝，鲨鱼和硬骨鱼成为水域的主人，四足动物最终进化成了恐龙和哺乳动物，征服了陆地。