Nowadays/In recent years/In modern society, 描述问题, which has/have been brought into focus/has/have aroused great concern .(进一步描述问题或变化)
The reasons for this phenomenon are varied. Among all these reasons, 原因一plays/play a critical role. Moreover/Furthermore/What's more,原因二. Besides,原因三.（产生这种现象的缘由）
In view of the seriousness of the problem, effective measures must be taken before things get worse. /Considering the seriousness of the problem, it is an urgent thing or us to take effective measures to解决该问题. Firstly/First of all,方法一. Secondly/Moreover,方法二. Thirdly/Besides/In addition,方法三. Only through these ways/Only in this way XXXX
