This is the 668th most frequent German word.
zweimal
Twice.
The word 'zweimal' is used here as an adverb indicating the number of occurrences (two) of the action described by the verb.
Ich war letztes Jahr zweimal im Kino.
I went to the cinema twice last year.
Here, 'zweimal' functions as an adverb to denote the frequency (two occurrences) within a specific time frame (a day).
Der Bus fährt zweimal am Tag vorbei.
The bus passes by twice a day.
In this sentence, 'zweimal' again serves as an adverb suggesting the repetition of the action (reading) for two times, emphasizing thorough understanding.