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verb | adjective | to phrases
challenges v
gen. desafíos; retos
challenge ['ʧælɪnʤ] v
law  poner objeción; tachar; objetar
challenged ['tʃælɪndʒd] v
math. reto
challenging ['ʧælɪnʤɪŋ] adj.
gen. desafiante; provocador
challenging: 8 phrases in 5 subjects
Construction1
General3
Law1
Radiolocation2
Technology1