但是对大部分人来说，受骨骼结构和肌肉韧带牵制的影响，我们的大腿旋转不了那么多。

For many of us, though, the thigh cannot turn out that much, either because of its bone structure or because tight muscles and ligaments inhibit its movement.

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这些细胞长成后，研究人员发现它们的结构已经分化成熟为各种成分并形成了牙本质、釉质、牙髓、血管及牙周韧带。

After growing them they found their structures had matured into the components that make teeth including dentin enamel dental pulp blood vessels and periodontal ligaments.

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重建后的韧带并不能恢复正常的超微结构、解剖学特征和生物力学性能。

Graft could not recovery the ultrastructure, anatomy and biomechanics of the normal ligament.

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