tb42"> in my mind , the following factors/reasons/causes need to be taken into consideration. 我认为，我们需要考虑下列因素/原因： There are several reasons for this phenomenon/why…-(as follows). 造成这种现象的原因如下：来源：考试大 And I would like to present two explanations for this: 对于此，我有如下两点愚见： The reasons are chiefly as follows. 主要原因如下： There are numerous reasons why ____, and I would like to explore a few of the most important ones here. 为什么___________，原因很多，在此列举几个较为重要的原因。 The reasons are presented below. 原因如下。 There are three premier(主要的)/best/ most important, largest, significant, obvious, crucial causes as follows. 以下这些是造成这一问题的最主要/最好/最重要/最大/最有意义/明显/至关重要的原因。 This is based on the propensity(倾向，原因) of following points. 这基于以下的原因。 The main reason is that.. 主要原因是_____________。 One very important argument for ….. is that…. _______的非常重要的原因便是____________________。 The reasons are quite clear. Above all, …. 原因非常清楚。首先（首要的是）__________。 The first reason can be seen by every person. 第一个原因其实很明显。 The first and most important reason is that….. 第一个而且最重要的原因是______________。 One of the reasons that are given for….is that…. ______________的原因之一是__________________。