1、significant
重要的;有意義的;
The learner's attention needs to be directed to the significant features.
需要將學習者的注意力引向那些著重點上
2、substantial
大量的;結實的;
Substantial numbers of rank and file members ignored their union's advice.
有相當一部分普通員工不理睬工會的建議
The West must back up its verbal support with substantial economic aid.
西方國家必須以切實的經濟援助來兌現他們的口頭支持 。