因此，无论是疏松或胶结，沉积物总体积都有一部分是由空隙组成的。

Thus a proportion of the total volume of any sediment, loose or cemented, consists of empty space.

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骨质疏松和股骨折已经成为一部分人的主要健康问题了，而目前的挑战是要区分出这样一部分高危人群。

While osteoporosis and hip fractures are major health concerns for some people, the challenge is finding out who is at risk and who is not.

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但是对一部分人来说，他们的骨密度会很快得降低，导致骨骼变得疏松，增加了骨折的风险性。

But for some, the decline in density is rapid, as their bones become porous and fracture risk increases.

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