Flat bones afford considerable protection and provide extensive areas for muscle attachment.

扁骨承担重要的保护功能，并为肌肉附着提供广泛的区域。

Your flat bones are the thinner ones, like your sternum and scapulae, and also the bones that make up your brain case.

你扁平的骨头是较薄的，比如胸骨和肩胛骨，还有构成你大脑外壳的骨头。

Spongy bone tissue is typically found in the heads of long bones and in the inner layer of flat bones like the sternum.

海绵状骨组织通常存在于长骨的头部和胸骨等扁平骨骼的内层。

Flat bones are generally thin and composed of two more or less parallel plates of compact bone enclosing a layer of spongy bone.

扁骨通常是菲薄的，由两层近似平行的密质骨骨板包绕一层松质骨组成。

Just the hand going. Waving my hand from side to side — it's a type of gliding movement, one that occurs when one flat bone surface glides over another.

只是手在动。左右挥动我的手——这是一种滑行运动，当一个平坦的骨骼表面滑过另一个时发生的。

Examples of flat bones include the cranial bones (which protect the brain), the sternum and ribs (which protect organs in the thorax), and the scapulae.

扁骨的实例包括颅骨（其保护大脑），胸骨与肋骨（其保护胸腔内器官）和肩胛骨。