These machines only need to be fixed very 'rarely'. = These machines 'rarely' need to be fixed.
Such radical opinions have 'rarely', 'if ever', been heard here before.
The temperature 'rarely' [='seldom'] drops below freezing here.
(..) as animals move into its heart. The new arrivals open up paths like arteries along which water flows, extending the reach of the flood. This is an Africa rarely seen - a lush water world. Some creatures are completely at home here. These are lechwe - antelope with hooves that splay widely, (..)2006 TvShow: Planet Earth Title: From Pole to Pole Season: 1 Episode 1