(the situation of being faced with) something that needs great mental or physical effort in order to be done successfully and therefore tests a person's ability: Finding a solution to this problem is one of the greatest challenges faced by scientists today
فروض المستوى الرابع إبتدائي جميع المواد المرحلة الأولى للدورة الأولى 2020-2021
ربي يجازيكم بالخير. ..والله العظيم راه كتفيدونا بزاف. .الله يرحم الوالدين أستاذة
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