求翻译：疾病擴張(morbidity expansion)指的是在疾病轉型的後期，人口死亡率長期大幅下跌以後，長期慢性疾病逐漸取代傳染性疾病為人口的主要死因，而死亡率持續下降的動力也逐漸由嬰幼年齡層移往中高年齡層，由於存活為疾病的必要條件，死亡與疾病間的替代性加強，在壽命水準向高齡端趨緩增漲的同時，疾病盛行率也同時增漲(Gruenberg 1977)；由於疾病盛行率上漲的意義是平均每個人存活在疾病狀態下的期間增長，則疾病盛行率上昇當然帶來醫療費用上漲的結果。簡而言之，疾病擴張與人口老化愈是晚近愈結合為一體兩面，則討論人口老化對醫療費用之影響時，不能避免引涉到疾病擴張的現象。是什么意思？

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Disease expansion (morbidity expansion) in the late disease in transition, long-term mortality rate plunged, long-term chronic disease gradually replacing infectious diseases for the population major cause of death, and mortality rates continued to drop the dynamics of infant gradually moved to youn

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Disease expansion (morbidity expansion) means of is in disease transformation of late, population mortality long-term sharply fell yihou, long-term chronic disease gradually replaced infectious disease for population of main death, and mortality continued fell of power also gradually by friendly you

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