For each bone X ray image, the distance from its features to the two prototypes in feature space is computed to provide an objective judgement on the degree of osteoporosis.

对每一幅骨x线图像，在特征空间中计算其特征到两个标准的距离来提供对骨质疏松程度的客观评价。

youdao

The astronauts' decrease in bone strength measured from point six percent to five percent for each month spent on the space station.

VOA: special.2009.03.10

The science is increasingly clear: Older adults need both strength training, to help replenish and maintain the muscle mass and (for women especially) the bone density our bodies lose each year as we age, and cardio to help guard against the risks of clogged arteries in the heart and brain.

WSJ: Exercise in Retirement: Cardio vs. Weight Training

Describing the sectors as "the back bone of Wales", Ms Hart explained that an advisory panel will be formed for each one led by independent chairs with membership finalised over coming weeks.

BBC: Enterprise and Business Committee