Example:
This article attempts to add a longitudinal dimension by reporting data collected in 1977 from 45 professional women who were originally interviewed in 1969. Their career and family patterns are investigated in terms of the family life cycle proposed by Duvall (1971) and a fourfold typology introduced here. It appears that the professional careers of these women have been influenced to some extent by marriage, but to a considerable extent by the presence of children. Many of the respondents voiced the opinion that while combining a professional career, marriage, and motherhood is very appealing in ideal terms, in reality it may require a "superwoman" to do so in the face of current American cultural norms.

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Note added at 12 mins (2008-10-23 07:52:15 GMT)
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Better example:
A Dictionary of Sociology
dual-career marriage: Marriages in which both partners pursue occupational careers. Such marriages are still relatively rare, and findings about dual-career marriages may not generalize to dual-earner families (where both partners are formally employed but only one—usually the male—pursues a career), which are now the norm. However, empirical studies suggest that both career women and those with less rewarding jobs appear to work a double shift, combining home and work responsibilities.
(http://www.encyclopedia.com/doc/1O88-dualcareermarriage.html...

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Note added at 15 mins (2008-10-23 07:54:47 GMT)
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Отже, вірний варіант - саме "будують кар'єру", адже обидва можуть працювати і заробляти гроші, але лише один може при цьому будувати кар'єру, в dual-career marriage кар'єру будують і чоловік і жінка.