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"Durante" is a preposition which is often translated as "during", and "en el cual" is a phrase which is often translated as "in which". Learn more about the difference between "durante" and "en el cual" below.
durante()
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
b. in
Se recomienda llevar gafas de sol durante el verano.We recommend wearing sunglasses in the summer.
c. for (before a specific period of time)
Mi compañía me ha dado una prima anual durante 10 años.My company has given me an annual bonus for 10 years.
en el cual()
A phrase is a group of words commonly used together (e.g., once upon a time).