In looking at population ageing we will consider two distinct dimensions.我们将从两个截然不同的角度来看人口老龄化问题。These statistics paint a clear picture of how the population is aging.这些统计数据清晰地展现了人口老龄化的过程。As populations age, funding retirement becomes more expensive.随着人口老龄化，供养退休人员会变得更加昂贵。