From the bar chart given above, we can observe that the life expectancy and infant mortality experienced some changes during the past several years. From 1960 to 1990, the life expectancy increased from 40 years old to roughly 60 years old. During the same period, the rate of infant mortality decreased from nearly 20% to 10%. The bar chart inform us of the phenomenon that people can live longer nowadays. What exactly contribute to this phenomenon ? Reasons can be listed as follows: for one thing, with the improvement of living standard, elderly people in mounting numbers are placing a high value on health care, thus people can live longer than ever before. When it comes to the decline of the rate of infant mortality, it can be attributed to the improvement of medical technology, many once-seemingly-incurable diseases could be healed nowadays, which means that less infant will suffer from fatal diseases and can lead a longer life. Rising life expectancy and decline of infant mortality is a symbol of social progress and economic development. However, it will also bring about some undesirable consequences such as the aging of population. Thus, the problem of how to deal with it should be on the agenda.
从上面的条形图中，我们可以看到，在过去几年中，预期寿命和婴儿死亡率会发生一些变化。从1960到1990，预期寿命从40岁增加到60岁。在同一时期，婴儿死亡率从近20%下降到10%。条形图告诉我们人们现在可以活得更长的现象。究竟是什么促成了这一现象？原因可以列出如下：一方面，随着生活水平的提高，越来越多的老年人是放置高价值的保健，因此人们可以比以往任何时候都活的时间更长。当谈到婴儿死亡率的死亡率下降，这可以归因于医疗技术的提高，许多曾经看似无法医治的疾病能被治好了现在，这意味着少婴幼儿将遭受致命的疾病和可能会导致更长的使用寿命。婴儿死亡率的上升是社会进步和经济发展的标志。然而，它也会带来一些不好的后果，如人口老龄化。因此，如何处理这一问题应放在议事日程上。