翼龙

Both the pterosaurs and the birds have hollow bones, a feature that represents a savings in weight.

翼龙和鸟都有中空的骨头，這是为了节省重量。

Both the pterosaurs and the birds have hollow bones, a feature that represents a savings in weight.

翼龙和鸟类都由中空的骨头，这一特征意味着减轻重量。

In the fossil record we also have evidence of flying dinosaurs called pterosaurs, some of which attained a remarkable size.

在化石记录，我们也有证据的飞行恐龙所谓的翼龙，其中一些达到了显着的大小。

Other groups that evolved flight, such as pterosaurs and bats, all evolved from small ancestors.

其他群体演变飞行，如翼龙和蝙蝠，所有的演变，从小型的祖先。

Instead he says that pterosaurs needed all four limbs for liftoff.

他说翼龙需要使用它们所有的四肢来起飞。

Perhaps the least controversial assertion about the pterosaurs is that they were reptiles.

或许关于翼龙最没有争议的断言是它们都是爬行动物。

Some pterosaurs, on the other hand, were the size of a giraffe.

不过，一些翼龙有长颈鹿那么大。

Both the pterosaurs and the birds have hollow bones, a feature that represents a savings in weight.

无论是翼龙和鸟类中空的骨骼，这一特点是一个节省重量。

Perhaps the least controversial assertion about the pterosaurs is that they were reptiles.

可能，最少引起争论的意见就是翼龙是爬行动物。

The largest animals ever to fly were pterosaurs.

曾经最大的飞行动物是翼龙。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。