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"Avoid" is a transitive verb which is often translated as "evitar", and "prevent" is a transitive verb which is often translated as "prevenir". Learn more about the difference between "avoid" and "prevent" below.
avoid()
A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
prevent()
A transitive verb is a verb that requires a direct object (e.g., I bought a book.).