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.
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.
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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