1.Some reasons eaIl explain this trend.First of all，…Secondly，…Furthermore，…一些原因可以解釋這一趨勢(shì)。首先，……其次，……另外，……

　　2.There are numerous reasons why…，and 1 would explore only a few of the most important ones here.……的原因有很多，這里我只想探討其中幾個(gè)最重要的原因。

　　3.A number of factors could account for/contribute/lead to/resuh in the change of…Firstly，…Secondly，…Thirdlv.…引起……變化的原因有好多，首先，……其次，……再次，……

　　4.We may blame/criticize…for…，but the causes/roots for the problem/phenomenon/trend go much deeper.我們或許會(huì)批評(píng)……因?yàn)?hellip;…但是這一問題(現(xiàn)象、趨勢(shì))背后有著更深層次的原因。

　　5.Thanks to/Owing to/Due to/Becanse of/As a resuh of…因?yàn)?hellip;…

　　6.Fmm my everyday experience and observation I can state several factors that defend the statement that…根據(jù)我的日常經(jīng)驗(yàn)和觀察，我可以舉出幾個(gè)因素來證明……

　　7.There are many reasons responsible for this instance，and the following are the typical ones.In the first place….In the second place，…導(dǎo)致這種現(xiàn)象的原因有好多，以下是其中比較有代表性的。第一個(gè)是……第二個(gè)是……

　　8.There are many reasons explaining this case.As for me，I consider the following as the typical ones.To begin with, …Secondly，…Last but not least，…有很多原因可以解釋該問題。就我而言，我認(rèn)為以下原因比較典型。一個(gè)是……第二個(gè)是……最后，……

　　9.Among the most sound/convincing reasons given/identified/advanced by people for…，one should be mentioned/emphasized.在各種常為人們所道的理由中，應(yīng)特別提一下……

　　10.One may attribute/ascribe/owe the increase/decrease/change to…人們可能將這一增長(zhǎng)(下降、變化)歸因于……

　　11.The success/failure mainly stems/results/arises/comes from the fact that…這一成功(失敗)主要源于這樣一個(gè)事實(shí)……

　　12.Any discussion about this problem would inevitably involve…任何對(duì)此問題的討論都不可避免地涉及到……

　　13.You don't have to look very far to find out/identify the reason why…你不必花費(fèi)很大的力氣就會(huì)找到……的原因。

　　14.The causes for…are varied.They include…Perhaps the main cause is…造成……的原因有好多，包括……。主要的原因可能是……

　　15.There are probably three/many/several/a varieties of reasons/causes for this dramatic/significant increase/decline in…引起……顯著增長(zhǎng)（下降）的原因有三個(gè)（許多、幾個(gè)、很多）。

　　16.The reason for this is not far to seek.The first reason is that…The second one is…The third is…For all this, the main cause of…is due to…這一問題的原因不難發(fā)現(xiàn)。第一個(gè)原因是……第二個(gè)是……第三……綜上所述，……最主要的原因應(yīng)該是……

　　17.Certainlv.…is not the sole reason for…，…is also responsible for the change/problem.當(dāng)然，……并不是唯一的原因。還有……也導(dǎo)致了這一變化(問題)的產(chǎn)生。

　　18.Perhaps the main/primary/fundamental/most important reason is…也許，最主要(根本)的原因是……

　　19.Another reason why I disagree with the above statements is that I believe…我不同意上述觀點(diǎn)的另一個(gè)原因是因?yàn)槲蚁嘈?hellip;…

　　20.It is no easy task to identify the reasons for this phenomenon which involves several complicated factors?要找出這一現(xiàn)象的原因并非易事，因?yàn)樗婕暗饺舾蓮?fù)雜的因素。

　　21.why…? For one thing，…for another，…為什么……？第一，……第二，……

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