有一种理论认为，两足动物的进化与核心家庭有关：一夫一妻制的父母合作照顾他们的后代。
One theory is that bipedality evolved in conjunction with the nuclear family: monogamous parents cooperating to care for their offspring.
因为它们是两足动物，它们的手臂可以自由地进化出拍打的翅膀，这在当时的爬行动物中是不可能的。
Because they were bipedal, their arms were free to evolve flapping flight, which cannot be said for other reptiles of their time.
两足动物指的是有两只脚的动物。
人类和鸟类都是两足动物。
后来的经验集中在与两足动物的前期工作。
实际上，两足动物的行走可能比四肢的行走花费更少的力气。
Walking as bipeds might actually use less energy than movement on all fours does.
腿：两足动物的下肢，与膝部连接，用于支撑身体并用来行走和奔跑。
Leg: in a Biped, the lower limb, jointed at the knee, supporting the Body and used for walking and running.
或者，它们是在地面奔跑的两足动物，不断进化的翅膀使它们跳动的步幅越来越远吗？
Or were they bipedal ground runners whose evolving wings allowed them to take progressively longer jumps?
了解如何调整完善变形体，动画任意多边形步行周期，两足动物的人群使用的工具。
Learn how to adjust physique for perfect deformation, animate a freeform walk cycle, and use crowd tools for bipeds.
在如今，连早期两足动物生活在树木繁茂甚至草木丛生的栖息地，这样一种看法都得到了广泛接受。
It is now generally accepted that the earliest bipeds lived in wooded, even forested habitats.
步法，脚步人或其他两足动物的步法，双脚轮流提空，一只脚的某一部分始终接触地面。
The gait of a human being or other biped in which the feet are lifted alternately with one part of a foot always on the ground.
步法，脚步：人或其他两足动物的步法，双脚轮流提空，一只脚的某一部分始终接触地面。
The gait of a human being or other biped in which the feet are lifted alternately with one part of a foot always on the ground.
例如，人的外延是任何人，如约翰和玛丽；内涵是“两足动物”“无羽毛的”“有理性的”等等。
For example, the denotation of human is any person such as John and Mary, and its connotation is "biped", "featherless", "rational", etc.
假如两大特征——两足动物和无毛发——结果是差不多同时出现的话，那么可能性的天平就会略微倾向于哈代了。
If it turns out that the big two - bipedality and nakedness - arose at roughly the same time, that might shift the balance of probability some little way toward Hardy.
但这个说法不能解释为什么“阿蒂”所属的物种还没完全脱离树上生活时就属于两足动物(能用两条腿走路的动物)。
But this does not explain why Ardi's species was bipedal (able to walk on two legs) while still living partly in the trees.
站在这样的巨人的肩膀上是ATRIAS，一系列人大小的两足机器人是提醒其他两足动物，如鸵鸟和鸸鹋我们。
Standing on the shoulders of such giants is ATRIAS, a series of human-sized bipedal robots that remind us of other two-legged creatures like the ostrich or emu.
这些玛雅教程是完美的动画师们想钻机机械的相互作用，车辆和机器人的两足动物和四足动物比其他任何对象的有机。
These Maya tutorials are perfect for animators who want to rig mechanical interactions, vehicles, and robots-any objects other than organic bipeds and quadrupeds.
有人非常中肯地质问柏拉图，既然一只拔光毛的鸡显然是一种“没有羽毛的两足动物”，那么根据他的定义它应该算人。
Very pertinently it was demanded of Plato, why a picked chicken, which was clearly "a biped without feathers, " was not, according to his own definition, a man?
作为两足动物，我们直立的习惯在动物界是独一无二的，这种习惯也是为了适应我们的身体和大脑而采取的一种特殊补偿。
Known as bipedalism, our habitual upright posture is unique in the animal kingdom and has arisen through specific complementary adaptations of the body and brain.
这证明，两足动物的演化史并不是在大草原上进行的。但是，由于毛发不会变成化石，因此很难确定原始人类在什么时候开始失去毛发。
That proved bipedalism did not evolve on the savannah, but since hair does not fossilise, it is hard to establish when the hominids began to lose it.
但由于缺少决定性的化石证据，关于这种灵长类动物是否是两足动物——以及她在人类的家族树中究竟占据什么位置——存在着许多猜测。
But lack of definitive fossil evidence has many guessing whether this primate was really a biped-and just where she might fit on the human family tree.
一直以来科学家们向我们揭示了越来越多古老的原始人类——这就意味着这些两足动物中包含有人类的直系祖先与最接近的亲属。
Who was the first hominid? Scientists are uncovering more and more ancient hominids all the time — here meaning bipeds including humans, our direct ancestors and closest relatives.
而可能更重要的是，你也从未将你的注意力分给那些与你同呼吸的两足哺乳动物上。
And, perhaps as importantly, you also can never devote your undivided attention to the biped mammals who are breathing air in the room with you.
最早的鸟类是从树上向地面滑翔的树栖生物，还是因进化出了翅膀而逐渐喜欢长距离跳跃的两足陆生动物？
Were the first flyers arboreal creatures that initially glided from tree tops to the ground? Or were they bipedal ground runners whose evolving wings allowed them to take progressively longer jumps?
最早的鸟类是从树上向地面滑翔的树栖生物，还是因进化出了翅膀而逐渐喜欢长距离跳跃的两足陆生动物？
Were the first flyers arboreal creatures that initially glided from tree tops to the ground? Or were they bipedal ground runners whose evolving wings allowed them to take progressively longer jumps?
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