四足动物的

Bipedalism might feel natural to us, but in fact it's a specialized adaptation that is rather difficult compared to walking on all fours - no wonder most apes and monkeys avoid it. It also explains our prevalent lower back pain.

对我们来说，我们可能感觉两足动物很自然，但是，事实上，两足行走比四足行走难多了，所以，大多数猩猩和猴子避免两足行走也不足为奇，这还解释了我们经常腰疼的原因。

The tarsal joint of the hind leg of a digitigrade quadruped,such as a horse, corresponding to the human ankle but bending in the opposite direction.

跗关节马等跗行四足动物后腿的跗关节，与人类的踝关节类似但弯曲方向相反溴的衍生物的活性要比相应的氯的衍生物大得多。

Having four feet with opposable first digit s,as primates other than human beings.

四足如手的有四足和与其他脚趾相对的第一个足趾的；如除人类以外的灵长类动物

Having four feet with opposable first digits , as primates other than human beings.

四足如手的有四足和与其他脚趾相对的第一个足趾的；如除人类以外的灵长类动物

Having four feet with opposable first digits,as primate s other than human beings.

四足如手的有四足和与其他脚趾相对的第一个足趾的；如除人类以外的灵长类动物

A foot with webbed toes.Having four feet with opposable first digits, as primates other than human beings.

四足如手的有四足和与其他脚趾相对的第一个足趾的；如除人类以外的灵长类动物

Research on the diversity of shape and structure of avian tarsometatarsus,not only did it present evidences to realize the ecological habit of birds of different species,but made the knowledge of functional behavior of avian hindlimbs perfect progressively also.

不同类型鸟类跗跖骨的形态多样性分异反映了鸟类对外界环境的选择性适应。1鸟类跗跖骨的特征1·1鸟类跗跖骨的组构在鸟类后肢骨骼系统中，其下端的跗跖骨为一块愈合完整的骨骼，这亦成为鸟类特有的骨骼结构，与其他四足动物(跗骨、跖骨由多块分离的骨骼组成)明显不同，鸟类由于飞行使得

Sixteen ( 15 new) amphibian and twenty-two ( 11 new) squamate species have been reported across China, including the oldest Chinese tetrapod Sinostega pani from the Late Devonian of Ningxia Hui Autonomous Region, the large stereospondyl amphibian Yuanansuchus laticeps from the Middle Triassic of Hubei Province, Late Jurassic/Early Cretaceous lissamphibians ( e. G., the anurans Callobatrachus sanyanensis and Mesophryne beipiaoensis, the caudates Jeholotriton paradoxus and Laccotriton subsolanus) from Northeast China, Paleogene lizards (e. G., Brevidensilacerta xichuanensis and Tinosaurus yuanquensis) from North China, and numerous lizards from the Late Cretaceous of Nei Mongol Autonomous Region.

共报道了16种两栖类和22种有鳞类，其中15种两栖类和11种有鳞类为新种，包括我国最古老的四足动物宁夏晚泥盆世的潘氏中国螈，湖北中三叠世的大型全椎两栖类宽头远安鲵，东北晚侏罗世/早白垩世的多种滑体两栖类(如无尾类三燕丽蟾和北票中蟾，有尾类奇异热河螈和东方塘螈)，华北古近纪的蜥蜴类(如淅川短齿蜥和垣曲响蜥)，以及内蒙古晚白垩世的多种蜥蜴类等。

Relat in g to the caudal end of the body in quadrupeds or the dorsal side in human be in gs and other primates.

背后的，尾部的与四足兽的身体尾部有关的，或与人类和其他灵长动物的背部有关的

There was nobody around to see it except some spectacularly stupid quadrupeds who hadn't the faintest idea what to make of it, or whether they were meant to make anything of it, or eat it, or what.

没人注意到这艘飞船，除了那些个愚蠢得波澜壮阔的四足动物，而它们那微弱的跟没有一样的脑袋就压根没想过这艘宇宙飞船是用什么造的，是用来干什么的，能不能吃，或者其他什么。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。