Que requer muito esforço.
Requiring a lot of hard effort.
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See how the word “árduo” is used in sentences
A subida foi longa e árdua. — The climb was long and arduous.
Um treino árduo transformou-o num nadador forte. — Arduous training turned him into a strong swimmer.
Porque escolheste um percurso tão árduo? — Why did you choose such an arduous route?
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