Marrow contains fat and other supportive tissue, but its most essential elements are blood stem cells.

骨髓中含有脂肪和其它支持组织，但它最重要的成分是造血干细胞。

Huge problem here because there's not enough supportive tissue here to prevent a serious serious injury.

这是个大问题 因为她没有足够的支持组织来防止严重的损伤。

Now, normally, that would be a major problem because without that supportive tissue, your teeth could fall out.

现在，通常情况下， 这将是一个大问题， 因为如果没有支撑组织，你的牙齿就会脱落。