骆驼是一种哺乳动物，但是几维鸟是一种鸟。
我的意思是，陆行鲸是一种哺乳动物，可以指明一个路上行走动物和水中游泳动物的清晰联系。
I mean, Ambulocetus is a mammal that shows a sort of bridge between walking on land and swimming.
鲸是一种哺乳动物。
作为一种哺乳动物，我们必须遵循生物规则。
海豚是一种哺乳动物。
人类是一种哺乳动物。
人类是一种哺乳动物。
骆驼是一种哺乳动物，但是几维鸟是一种鸟。
鲸是一种哺乳动物。
土豚是一种哺乳动物，它们挖地洞捕食蚂蚁和白蚁。
The aardvark is a mammal that burrow into the ground to catch ants and termites.
真正可以飞的动物只有鸟类、昆虫还有一种哺乳动物——当然那就是蝙蝠。
The only animals that can truly fly are birds, insects, and one type of mammal, which is of course the bat.
而且，几条证据的线索指出，脯氨酸作为一种哺乳动物大脑中突触之传导的调节器。
Furthermore, several lines of evidence suggest that proline may serve as a modulator of synaptic transmission in the mammalian brain.
每一种哺乳动物、鸟类和大多数爬行动物、两栖类动物和鱼类都需要睡眠来维持正常的生命活动。
Each kind of mammals, birds and most reptiles, amphibians animals and fish are in need of sleep to maintain normal life activities.
鸭嘴兽（Ornithorhynchusanatinus）是仅有的两种卵生的哺乳动物之一，另一种为食蚁兽（spiny anteater），它产卵。
The platypus (Ornithorhynchus anatinus) is one of only two mammals, the other is the echidna (spiny anteater) that lays eggs.
沿海假说提出了一种以捕猎海洋哺乳动物、收集捕捞咸水鱼和使用船只为基础的经济模式。
The coastal hypothesis suggests an economy based on marine mammal hunting, saltwater fishing gathering, and the use of watercraft.
海岸假说提出了一种以捕猎海洋哺乳动物、捕捞咸水鱼类、采集贝类和使用船只为基础的经济模式。
The coastal hypothesis suggests an economy based on marine mammal hunting, saltwater fishing, shellfish gathering, and the use of watercraft.
今年唯一被列入名单的哺乳动物是马达加斯加山鼠，一种生活在马达加斯加山区森林里的啮齿动物。
The only mammal added to the list this year was the Eastern Voalavo, a rodent that lives in the mountainous forests of Madagascar.
尽管de Ricqlès 极力主张谨慎对待，主张恐龙生理学的一种中间类型，但这一代古生物学家已经开始相信恐龙骨骼与哺乳动物相似。
Although de Ricqlès urged caution, arguing for an intermediate type of dinosaur physiology, a generation of paleontologists has come to believe that dinosaur bone is mammalian like.
其他哺乳动物如鸭嘴兽和一些鼩鼱是有毒的，这意味着它们会在体内产生一种毒素。
Other mammals, such as the platypus and some shrews, are venomous, meaning they produce a toxin internally .
蝙蝠是唯一能飞很远的哺乳动物，但它们还有另一种能力。
Bats are the only mammals that can fly a great distance, but they have another ability.
季节性迁徙是另一种逃避方式，特别是对大型哺乳动物或鸟类来说尤为如此。
Seasonal migration is another form of escape, especially for large mammals or birds.
玩耍似乎是具有相当复杂的神经系统的动物（主要是鸟类和哺乳动物）的一种发育特征。
Play appears to be a developmental characteristic of animals with fairly sophisticated nervous systems, mainly birds and mammals.
白暨豚是一种美丽的哺乳动物，在食物链中的位置处于上端，仅次于人类。
The baiji is a beautiful mammal, on top of the food chain, close to human beings.
科学家称，在坦桑尼亚的山林中发现了一种全新的哺乳动物。
A new species of mammal has been discovered in the mountains of Tanzania, scientists report.
与其他通过伤疤进行愈合的典型哺乳动物不同，这些老鼠则通过形成一种胚基以帮助细胞快速生长。
Unlike typical mammals, which heal wounds by forming a scar, these mice begin by forming a blastema, a structure associated with rapid cell growth.
在这种情况中，人类遵循哺乳动物中普遍存在的一种模式：雄性敌视雌性与其前配偶所生的子女。
In this, humans follow a pattern that is widespread in mammals: male hostility to a female's offspring from previous matings.
几乎自然界中所有的物种，从单细胞生物到哺乳动物(包括人类)，都具有一种日常活动周期，称为昼夜节律。
Virtually all species in nature, from single-cell organisms to mammals, including humans, exhibit a daily cycle of activity called circadian rhythm.
此次大灭绝之前，兽孔目爬行动物（一种类哺乳动物）的数目远远多于恐龙的祖先祖龙。
Until this disaster, mammal-like creatures known as therapsids were actually more numerous than the ancestors of the dinosaurs, known as archosaurs.
鸭嘴兽(Ornithorhynchusanatinus)是仅有的两种卵生的哺乳动物之一，另一种为食蚁兽（spiny anteater）。
The platypus (Ornithorhynchus anatinus) is one of only two mammals — the other is the echidna (spiny anteater) — that lays eggs.
鸭嘴兽(Ornithorhynchusanatinus)是仅有的两种卵生的哺乳动物之一，另一种为食蚁兽（spiny anteater）。
The platypus (Ornithorhynchus anatinus) is one of only two mammals — the other is the echidna (spiny anteater) — that lays eggs.
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