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鸟类

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A tetrapod is a vertebrate with two pairs of limbs, such as an amphibian, bird or mammal.

四足动物是一种拥有两对肢的脊椎动物,比方像两栖动物、鸟类、或哺乳动物。

Reed is used in many areas for thatching roofs.

用途芦苇是保护湿地环境和野生动物的重要物种,许多种鸟类栖息在芦苇丛中。

Component structure of the outer covering and flight surfaces of all modern bird s.

现代鸟类体表和翼面覆盖的结构。

Component structure of the outer covering and flight surfaces of all modern birds.

现代鸟类体表和翼面覆盖的结构。

Birds are descended from theropod dinosaurs like these - over 100 characters in the skeleton link these groups.

鸟类是从兽脚亚目恐龙演变下来的--超过100个骨骼方面的特征和这个种族有相似之处。

Compelling fossil evidence is now to hand that places birds as a specialized clade within theropod dinosaurs.

来自化石的证据表明,鸟类在进化分支上应归于兽脚类的特殊分支。

Archaeopteryx lived in the late Jurassic Period around 150-155 million years ago,despite its small size, broad wings, and ability to fly, Archaeopteryx has more in common with small theropod dinosaurs then it does with modern birds.

始祖鸟生活在侏罗纪晚期,约1亿5千5百万到1亿5千万年前。它具有体积小,翅膀宽广,并且能够飞行等与现代鸟类相似的特点,但它和小型兽脚类恐龙有更多相似的特点。

The 1.8m-long predator was a dromaeosaurid - a family of theropod dinosaurs from which modern birds descended.

体长1.8米的这种肉食性恐龙是驰龙的一种,属兽脚亚目食肉恐龙家族,是现代鸟类的祖先。

Seventy-one bird species have disappeared forever since people first arrived on the Hawaiian Islands one thousand seven hundred years ago.

自1,700年以前人类第一次踏上夏威夷群岛,已经有71种鸟类永久的消失了。

Waldemar Daa wanted to build a noble ship, a man-of-war, a three-decker, which the king would be sure to buy; and these, the trees of the wood, the landmark of the seamen, the refuge of the birds, must be felled.

瓦尔德马的DAA想建立一个崇高的船,一个人的战争,三年双层,其中国王一定会买;和这些树木的木材,具有里程碑意义的海员,在避难的鸟类必须砍伐。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。