Usages of eficaz
Ora, não acho que a iniciativa seja eficaz.
Well, I do not think that the initiative is effective.
Ora bem, a iniciativa da vizinhança é muito eficaz.
Now then, the neighborhood's initiative is very effective.
Eu aplico o sérum diariamente, porque é bem mais eficaz.
I apply the serum daily, because it is much more effective.
Este tratamento é ainda mais eficaz contra as rugas.
This treatment is even more effective against wrinkles.
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