模板：表示变革
1. Some changes have taken place in the past five years.
2. A great change will certainly be produced in the world’s communications.
3. The computer has brought about many changes in education.
例句：
Some changes have taken place in people’s diet in the past five years. The major reasons for these changes are not far to seek. Nowadays, more and more people are switching from grain to meat for protein, and from fruit and vegetable to milk for vitamins.
表示变革的短语：
1. at the thought of一想到…
2. as a whole (=in general) 就整体而论 3. at will 随心所欲
4. (be) abundant in(be rich in; be well supplied with) 富于，富有
5. access(to) (不可数名词) 能接近，进入，了解
6. in advance (before in time) 预告， 事先
7. to advantage 有利的，使优点更加突出地
8. have an advantage over 胜过
9.have the advantage of 由于…处于有利条件