interpretation of verse of ' الرِّجَالُ قَوَّامُونَ عَلَى النِّسَاء'?

According to following verse ,what does' الرِّجَالُ قَوَّامُونَ عَلَى النِّسَاء 'mean? > الرِّجَالُ قَوَّامُونَ عَلَى النِّسَاء بِمَا فَضَّلَ اللّهُ بَعْضَهُمْ > عَلَى بَعْضٍ وَبِمَا أَنفَقُواْ مِنْ أَمْوَالِهِمْ فَالصَّالِحَاتُ > قَانِتَاتٌ حَافِظَاتٌ لِّلْغَيْبِ بِمَا حَفِظَ اللّهُ وَاللاَّتِي > تَخَافُونَ نُشُوزَهُنَّ فَعِظُوهُنَّ وَاهْجُرُوهُنَّ فِي الْمَضَاجِعِ > وَاضْرِبُوهُنَّ فَإِنْ أَطَعْنَكُمْ فَلاَ تَبْغُواْ عَلَيْهِنَّ > سَبِيلًا إِنَّ اللّهَ كَانَ عَلِيًّا كَبِيرًا > > men are the maintainers of women for that allah has preferred in > bounty one of them over another, and for that they have spent of their > wealth. righteous women are obedient, guarding in secret that which > allah has guarded. those from whom you fear rebelliousness, admonish > them and desert them in the bed and leave them. then, if they obey > you, do not look for any way against them. allah is high, great.