This is the 7329th most frequent Catalan word.
aplicava
"Aplicava" means "applied" (past tense of "apply").
In this sentence, 'aplicava' is used to indicate that the subject ('Ell') was using or putting into practice some knowledge in a professional setting.
Ell aplicava els coneixements en la seva feina.
He applied the knowledge in his work.
Here, 'aplicava' means to spread or apply something onto a surface, referring to sunscreen application.
Ella aplicava crema solar abans d'anar a la platja.
She applied sunscreen before going to the beach.
In this case, 'aplicava' refers to implementing or using new methods or strategies in a teaching environment.