These flared ends, or epiphyses bookend the bone's shaft, or diaphysis, which — instead of having spongy bone in the center — surrounds a hollow medullary cavity that's full of that yellow marrow.

些张开的末端，或称骨骺，包围骨干，或骨干，骨干的中心不是骨，而是包围一个充满黄色骨髓的空心髓腔。