11. frequent adj.频繁的,经常的 ________ n 频繁性,频率______________ adv.频繁地 12. origin n. 起源,起因,出身___________ adj_原始的;最初的;独创的; _ ____________ adv原始地;最初地;独创地 13. unusual adj.特别的,不寻常的_________adv.特别地___________adj.寻常的 14. association n协会,关联,联系____________v.联系_____________adj关联的,联合的 15. unfair adj.不公平的________n.公平,美好 _______adj.公平的,白皙的,金黄的
frequency
frequently
original
originally
unusually
usual
associate
associated
fairness
fair