人类表现出的利他主义行为可以很好地为这一点提供准确的线索，从而使人类的利他行为和两性选择之间产生了联系。
Displays of altruism could well have provided accurate clues to this and so led to a link between human altruism and ual selection.
世界卫生组织（世卫组织）选择 “两性与烟草：关注针对女性的促销行为”作为将于2010年5月31日开展的世界无烟日活动的主题。
The World Health Organization (WHO) selects "Gender and tobacco with an emphasis on marketing to women" as the theme for the next World No Tobacco Day, which will take place on 31 May 2010.
同居作为男女两性间的一种生活共同体，已逐渐在生活中出现并得到人们的认可，这是人们对生活方式的另一种选择，体现了人们对自己生活的一种态度。
As a community between the male and female, cohabitation has been gradually approbated by people. It is another choice of life style and incarnates the attitude of life.
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