求翻译：A life-style that apparently exists in all societies is marriage-a socially sanctioned union between a man and a woman with the expectation that they will play the roles of wife and husband. After studying extensive cross-cultural data, the anthropologist Murdock concluded that reproduction,　sexual relations,　economic cooperation,　and the socialization of offspring are functions of families throughout the world.　We now recognize that Murdock overstated the matter,　since there are a number of societies-for instance,　Israeli Kibbutz communities-in which the family does not encompass all four of these activities.　What Murdock describes are commonly encountered tendencies in family functioning in most cultures.是什么意思？

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