难的：difficult=troublesome=burdensome=thorny

　　不可或缺的：necessary=indispensable=inevitable=irreplaceable=unavoidable

　　重要的：important=crucial， critical， essential， vital

　　=be importance=be of cruciality=be of criticality= be of essentiality=be of vitality

　　巨大的：large=enormous， tremendous， considerable， appreciable

　　正确的(correct)=仔细的(careful)=arduous=assiduous

　　有道理的：reasonable=rational and plausible

　　吸引人的：attractive=inviting and appealing

　　足够的：adequate and sufficient

　　很多，许多：A a wealth of

　　a flood of

　　vast arrays of

　　B a tremendous(enormous/considerable/appreciable) amount(number/sum) of

　　更，越来越：more and more

　　A 更+ 具体名词(比如钱，人数等) a growing/increasing/climbing number/amount/sum of

　　抽象名词(比如影响，重要性)growing/increasing/climbing

　　=B 更+形容词 growingly/increasingly/climbingly

　　=C 更+动词 to a larger extent