Component structure of theoutercovering and flight surfaces of all modern birds.
现代鸟类体表和翼面覆盖的结构。
2
Theoutercovering of the egg is waterproofed to prevent the embryo from drying out.
鸡蛋的外壳是不透水的，防止胚胎失水。
3
This can lead to something called an epidural haematoma, where blood builds up between theoutercovering of the brain and the skull, with consequent pressure on the brain itself.