...在胚胎发育 阶段出现,随后或多或少被脊柱所取替,而且脊柱是由许 多脊椎骨前后连接而成,故称脊椎动物,也称有头类 (Craniata)。 分六纲: 1、圆口纲(Cyclostomata):体呈鳗形,无颌,无成对 附肢,脊索终生存在。
基于4356个网页-相关网页
按照我们的分类标准,仅是本世纪的头十年,我们就发现了大约300种哺乳动物新物种——大部分是啮齿类,也有有袋类,突吻鲸类以及大量的灵长类动物。
Even within our own class, mammals, roughly 300 new species have been discovered in the first decade of this century-mostly rodents, but also marsupials, a beaked whale and a slew of primates.
在描述中,透特的样子通常是个长着鹮头的人,为纪念他,有上百万只鹮类被做成了木乃伊。
Thoth was often depicted as a man with the head of an ibis, and millions of ibis were mummified in his honor.
那就是说,这辆车真的有在一些没有测速摄像头的地方开到时速140英里的能力(田地、斯佩河、尼维峰、黑泽沙滩……那一类的地方)。
That said, it does have the ability to tear along at 140mph in areas that don't yet have speed cameras (fields, the River Spey, Ben Nevis, Blackpool beach - that kind of thing).
应用推荐