如今，人们越来越长寿，受教育程度也提高了。
一般来说，体形越大的动物越长寿。
Generally speaking, larger animals live longer than smaller animals.
随着生活水平的提高和医学的进步，人们越来越长寿。
With the growing standard of living and current medical science , people tend to live longer and longer.
而且随着人类开始变得越来越长寿，以上的问题将趋于恶化。
And, as more people live longer, the problem is going to get worse.
《心理科学》杂志发表的一项研究成果称，人们笑得越开怀，活得就越长寿。
The broader your smile is, the longer you are likely to live, a study published in Psychological Science suggested.
《心理科学》杂志发表的一项研究成果称，人们笑得越开怀，活得就越长寿。
The broader your smile is, the longer you are likely to live, a study published in Psychological Science suggested.
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