原因是显而易见的：美国的人口老龄化意味着更多工作机会。
人口变化是劳动力老龄化的又一原因。
Demographic change is another reason why the workforce is greying.
许多日本人对老龄化问题不以为然，部分原因是因为老年人们继续靠着大量的储蓄过着舒适的生活。
Many in Japan shrug off the problem of ageing. That is partly because the elderly continue to live comfortably on their vast hoard of savings.
老龄化推动成本上升显然是迟早的事(详见我们就此专题的特别报道)，但是它也还不是最重要的原因。
Ageing will clearly push up costs in time (see our special report in this issue), but it is not the main culprit yet.
不管某些人是怎样认为的，导致如此高昂医疗成本的原因绝不仅仅是老龄化的人口。
Despite what some have suggested, the reason we have these costs is not simply because we have an aging population.
由于外伤、肿瘤、炎症、老龄化等原因造成的人体硬组织缺损修复，是目前口腔医学及临床医学急待解决的难题。
Due to trauma, tumor, inflammation, aging and other causes of human hard tissue defects, which is the oral medicine and clinical medicine need to be solved problems.
由于外伤、肿瘤、炎症、老龄化等原因造成的人体硬组织缺损修复，是目前口腔医学及临床医学急待解决的难题。
Due to trauma, tumor, inflammation, aging and other causes of human hard tissue defects, which is the oral medicine and clinical medicine need to be solved problems.
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