2、positive, favorable, rosy (美好的)，promising (有希望的)，perfect, pleasurable , excellent, outstanding, superior替换good
3、dreadful, unfavorable, poor, adverse, ill (有害的)替换bad 如果bad做表语，可以有be less impressive替换
eg.An army of college students indulge themselves in playing games,enjoying romance with girls/boys or killing time passively in their dorms. When it approaches to graduation ,as a result, they find their academic records are less impressive.
4、(an army of, an ocean of, a sea of, a multitude of ,a host of, many, if not most)替换many.
注：用many, if not most 一定要小心，many后一定要有词。
Eg. Many individuals, if not most, harbor the idea that….同理 用most, if not all ,替换most.