(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
Showing posts with label فروض المرحلة الثانية جميع المستويات. Show all posts
Showing posts with label فروض المرحلة الثانية جميع المستويات. Show all posts
