rarely
The German word 'selten' is an adverb that is used to express the infrequency of an action or event. It is equivalent to the English word 'rarely'. For example, 'Ich gehe selten ins Kino' means 'I rarely go to the cinema'.
It is rare to see snow in April.
This is a simple declarative sentence where the adjective 'selten' is used to describe an unusual occurrence, which is seeing snow in April.
I rarely see him.
In this case, 'selten' describes the frequency of an action, stating that the occurrence of the action, seeing him, is rare.
She rarely reads books.
In this context, 'selten' is used to describe the infrequency with which a person performs an action, which in this case is reading books.