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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。

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。

The wind that made such waves however, might have been too strong for the pterosaurs to control their flight once airborne.

风，使这种波然而，可能是过于强烈的翼龙控制其飞行一次空降。

The second hypothesis seems unlikely because large pterosaurs could not have landed in trees without damaging their wings.

第二种看来也不可能，因为大型翼龙不可能降在树上而不伤害它们的翅膀。

The second hypothesis seems unlikely because large pterosaurs could not have landed in trees without damaging their wings.

第二种假设，似乎不大可能，因为大翼龙无法降落在树木不损害自己的翅膀。

Pterosaurs were a peculiar mixture of bird and bat.

翼龙是鸟类和蝙蝠的奇特混合物。

If the pterosaurs walked on all fours, the three short fingers may have been employed for grasping.

翼龙在靠四肢爬行时，其他的3个指主要用于抓取。

The wind that made such waves however, might have been too strong for the pterosaurs to control their flight once airborne.

然而，能引起这种海浪的风，可能会太强以至翼龙很难控制飞行，一旦它们什空。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。