一：开头
one ：
Recently the phenomenon has become a heated topic.
two：
Recently the problem has been brought into focus.
three：
Nowadays,there is a growing concern over……
four：
It is well-known that…
five：
According to a recent survey…
six：
With the development of science and technonlogy ,more and more people believe that……
随着科技的发展，越来越多的人认为……