定位句：Because the source of a hot spot remains fixed while a surface plate moves over it, OVER A LONG PERIOD OF TIME an active plume creates a chain of volcanoes or volcanic islands, a track marking the position of the plume relative to the moving plate.
However, recognizing employers' power over workers as a central factor in African Americans' economic marginalization, African American workers saw the need to join with White workers in seeking change
C同义改写 organised efforts-=join with 而且后文还有The persistent efforts 经济边缘=取非 经济发展 雇主权利凌驾于工人之上=取非 empower all workers
However, recognizing employers' power over workers as a central factor in African Americans' economic marginalization, African American workers saw the need to join with White workers in seeking change
C同义改写 organised efforts-=join with 后切后文还有The persistent efforts 经济边缘=取非 经济发展 雇主权利凌驾于经济之上=取非 empower all workers
Alternatively, small mammals such as mice and ground squirrels are important in the diet of many waterfowl-nest predators and can themselves be important predators of songbird nets.
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定位句：Because the source of a hot spot remains fixed while a surface plate moves over it, OVER A LONG PERIOD OF TIME an active plume creates a chain of volcanoes or volcanic islands, a track marking the position of the plume relative to the moving plate.