Objective To study the pathological characteristics of primitive neuroectodermal tumor(PNET) of bone and soft tissue.

目的探讨原始神经外胚层瘤（PNET）的病理学特点及其临床意义。

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They used primitive weapons made mostly of wood and bone .

他们的武器相当原始，主要是木材与骨头。

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Despite primitive methods and materials, some of these early implants actually fused with the bone.

尽管材料和方法原始，但事实上这些早期的种植体已经和骨骼融合在一起了。

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The researchers showed that it could be used to grow mesenchymal stem cells (MSCs), a kind of primitive cell derived from bone marrow that can be easily grown in culture.

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