osteoporosis
noun [ U ] uk/ˌɒs.ti.əʊ.pəˈrəʊ.sɪs/ us/ˌɑː.sti.oʊ.pəˈroʊ.sɪs/
骨质疏松（症）
a disease that causes the bones to become weaker and easily broken
Osteoporosis afflicts many older women. 许多老年妇女深受骨质疏松之苦。
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