六钩蚴小钩从外至内由颗粒带、纤维层和芯髓组成。

The hooks were composed of outer pellet layer, the middle fibrous layer and the central core marrow.

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六钩蚴小钩从外至内由颗粒带、纤维层和芯髓组成。

The hooks were composed of outer pellet layer, the middle fibrous layer and the central core marrow.

youdao