2、every coin has two sides.任何事都有正反两方面。
3、just as the saying goes.正像谚语所说。
4、with rapid development of science and technology,more and more people.随着科技的快速发展,越来越多的人。
5、it is common believed that.人们普遍认为。
6、nowadays there is a growing concern over.最近,引起了人们的关注。
7、it is universally acknowledged that.全世界人都知道。