01
今日长难句
But height loss can also be due to osteoporosis, a bone disease that develops when bone mineral density and bone mass decreases, or when the quality or structure of bone changes.
02
词汇解析
height loss 变矮
osteoporosis [ˌɑːstioʊpəˈroʊsɪs] n. 骨质疏松（症）
density [ˈdensəti] n. 密度，浓度
bone mineral density 骨密度
bone mass 骨量
decrease [dɪˈkriːs ] v. 减少，降低
03
结构分析
✔句子主干：
But height loss can also be due to osteoporosis
✔同位语：
a bone disease
✔定语从句：
that develops
✔状语从句1：
when bone mineral density and bone mass decreases
✔状语从句2：
or when the quality or structure of bone change
04
参考译文
But height loss can also be due to osteoporosis, a bone disease that develops when bone mineral density and bone mass decreases, or when the quality or structure of bone changes.
Version1：但变矮也可能是骨质疏松导致的。骨质疏松症是一种骨骼疾病，当骨密度和骨量下降时，或当骨骼质量或结构发生变化时，就会发生。
Version2：但变矮也可能是由骨质疏松导 致的，骨质疏松指的是骨密度和骨量下降，或骨骼质量或结构发生改变。
