短语词组短语bone trabecular space 骨小梁间隙bone space structures 骨空间结构trabecular bone space 骨小梁间隙bone mineral loss in space 航天骨矿物质脱失space bone osteoporosis 航天骨疏松space bone demineralization 航天骨矿质脱失space bone mineral 航天骨矿物质脱失 返回 bone space