Leonard tilted his chair back on two legs and stretched his long body.
伦纳德把他的椅子向后斜着撑在两条脚上，然后舒展他修长的身躯。
Some walked on two legs; some walked on four.
有些生物两只腿走路，有些四只腿走路。
This manual fixation—an indirect by-product of walking upright on two legs—has helped yield numbers in most cultures, but not all.
作为用两条腿直立行走的间接副产品，对手的过分关注帮助大多数文化产生了数字，但并非所有文化都是如此。
The ape shoulder is good for hanging from a tree, but when our ancestors started walking on two legs, the shoulder started to change.
猿猴的肩膀有利于其在吊在树上，但是当我们的祖先开始以两条腿走路以后，猿猴的肩膀也开始发生变化。
No prey can elude them on two legs or four.
没有猎物可以从他们手上逃脱，不管是用两条腿还是四条腿。
Maiasaura walked on four legs and ran on two legs. They were fast runners.
慈母龙用四条腿走路，跑步时用两条腿，它们跑得很快。
It is also the fastest creature on two legs and can run up to 43 miles per hour.
而且它也是跑得最快的双足动物，飞奔时速能够达到43英里。
But somewhere along the line, primates discovered how to stand up and walk on two legs.
但在进化线上的某处，灵长类动物发现如何用两条腿站起来走路。
You may have seen other animals stand on two legs briefly, such as a cat or a dog.
或许，你有时也会看到像猫或狗等其它动物用两腿站立着。
We walk upright on two legs and our newborns are helpless. Our babies are unusually large.
我们用两条腿直立行走，我们的新生宝宝非常无助，也大得不寻常。
At that time there were still dolphin beings who walked on two legs, and breathed air.
当时还有用两条腿行走，呼吸空气的海豚人。
The question, then: Why stand and walk on two legs when our ape Cousins get by on four limbs?
问题就随之而来了：为什么在我们的类人猿亲戚们还在用四肢行走的时候，我们就已经直立并用两足行走呢？
As time passes the swine adopt human traits soon wearing clothes and walking on two legs.
时间推移，猪采用了人类的特征，很快就穿上衣服，用两条腿走路。
The world's fastest animal on two legs is the new mascot for a Pennsylvania baseball team.
世界上奔跑最快的两条腿生物成为宾夕法尼亚一支棒球队的新吉祥物。
In a just society, we walk around on the ground on two legs, thinking, feeling and choosing.
在一个公正的社会，我们在地上用两条腿走路，思考着、感受着、选择着。
The mouse was not look like the real mouse, it stood on two legs and had big eyes and ears.
这个老鼠不像真正的老鼠，它两条腿站立，有大眼睛和耳朵。
As time passes, the swine adopt human traits, soon wearing clothes and walking on two legs.
时间推移，猪采用了人类的特征，很快就穿上衣服，用两条腿走路。
Tyrannosaurus Rex walked on two legs. It could run very fast. It could run 30 miles per hour.
霸王龙走路时用两条腿，它能跑的很快，每小时的速度可达30英里。
It was walking on two legs like a human and looked about 150 centimetres tall," said Takahashi.
它像人一样，用两条腿走路，身高约1米5。
Deinonychosaurs, such as the velociraptor, walked on two legs, ate meat and had vicious retractable claws.
“恐爪龙类”比如“伶盗龙”，用两条腿走路，食肉，有邪恶的可伸缩的爪。
Based on the domestic market, at the same time explore the international market, to walk on two legs.
立足国内市场，同时开拓国际市场，用两条腿走路。
But this does not explain why Ardi's species was bipedal (able to walk on two legs) while still living partly in the trees.
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)。
Asimo, which stands for Advanced Step In Innovative Mobility, is one of a very few robots that can walk reliably on two legs.
Asimo是高级步进灵活发明，是不多的仅仅靠两条腿走路的机器人。
The iguanodon lived in groups. they were sort of smart. they could run on two legs or walk on four legs. they could run fast.
禽龙成群生活。它们有点聪明。它们跑步时用两条腿，走路用四条腿，禽龙能跑得很快。
Though the thing could obviously walk on two legs, it scurried up the moonlit slope on all fours, moving as swiftly as a snake.
虽然这东西明显可以用两条腿行走，它却是用四条腿像蛇般迅速的窜上月色下的斜坡的。
Why do humans walk on two legs? Our ancestors evolved an upright posture well before our large brains or stone tools even appeared.
在我们的大脑进化和石器工具出现以前，我们的祖先就已经进化成为了直立的姿势。
Conventional wisdom says our earliest ancestors first stood up on two legs when they moved out of the forest and into the open savannas.
传统观点认为当人类最早的祖先最初从丛林迁移到平原时，开始用两条腿站立。
Conventional wisdom says our earliest ancestors first stood up on two legs when they moved out of the forest and into the open savannas.
传统观点认为当人类最早的祖先最初从丛林迁移到平原时，开始用两条腿站立。
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