健康的骨骼 meaning in English

good bones

It is well known that estrogen is essential for healthy bone , and that when the production of estrogen is reduced , as occurs normally in postmenopausal women and pathogenically after exposure to radiation or chemotherapeutic drugs , bones become brittle and break easily
众所周知，雌激素对于健康的骨骼是必需的，当体内雌激素的含量降低的时候，就像正常的绝经后妇女那样，有时候在一些病理状态下如接受放疗或服用化疗药物也会出现，这时候骨骼就会变脆而且非常容易骨折。