1．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)。
2．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，……
3．why…? For one thing，…for another，…為什么……?第一，……第二，……
4．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……
5．Perhaps the main／primary／fundamental／most important reason is…也許，最主要(根本)的原因是……
6．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……
7．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。
8．Certainlv．…is not the sole reason for…，…is also responsible for the change／problem．當(dāng)然，……并不是的原因。還有……也導(dǎo)致了這一變化(問題)的產(chǎn)生。
9．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。
10．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。
11．Thanks to／Owing to／Due to／Becanse of／As a resuh of…因?yàn)椤?BR> 12．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……
13．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)……
14．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……
15．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……
16．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)槲蚁嘈拧?BR> 17．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)椤沁@一問題(現(xiàn)象、趨勢(shì))背后有著更深層次的原因。
18．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……
19．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……
20．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，……
21．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，……
2．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，……
3．why…? For one thing，…for another，…為什么……?第一，……第二，……
4．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……
5．Perhaps the main／primary／fundamental／most important reason is…也許，最主要(根本)的原因是……
6．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……
7．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。
8．Certainlv．…is not the sole reason for…，…is also responsible for the change／problem．當(dāng)然，……并不是的原因。還有……也導(dǎo)致了這一變化(問題)的產(chǎn)生。
9．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。
10．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。
11．Thanks to／Owing to／Due to／Becanse of／As a resuh of…因?yàn)椤?BR> 12．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……
13．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)……
14．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……
15．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……
16．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)槲蚁嘈拧?BR> 17．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)椤沁@一問題(現(xiàn)象、趨勢(shì))背后有著更深層次的原因。
18．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……
19．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……
20．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，……
21．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，……