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[Subject: Physics]
Translated by: CHERBINO SONIA
Translated in 48 languages
[Subject: Technology (Applied Sciences)]
Translated by: ISAAC SMITH
Translated in 31 languages
[Subject: Generalities]
Translated by: INÊS SOARES
Translated in 12 languages
Translated in 14 languages
- ser difícil, penoso ; exigir muito esforço ou trabalho
Translated by: DAVID LAURENT
Translated in 3 languages