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.
5: a slice of, quiet a few , several替换some
6:harbor the idea that, take the attitude that,
hold the view that, it is widely shared that,
it is universally acknowledged that)替think
(因为是书面语，所以要加that)
7:affair ,business ,matter 替换thing
8: shared 代 common
9.reap huge fruits 替换get many benefits )
10:for my part ,from my own perspective 替换 in my opinion
11:Increasing(ly),growing 替换more and more( 注意没有growingly这种形式。所以当修饰名词时用increasing/growing.修饰形容词，副词用increasingly.
Eg.sth has gained growing popularity.
Sth is increasingly popular with the advancement of sth.