1.There are many factors / reasons accounting for this result.However, the following are the most typical ones.Firstly, … Secondly,… Last but not least,…有许多因素/原因解释这个结果。然而，以下是最典型的因素。首先，… 其次，… 最后但是同样重要的是，…
account for：说明（原因、理由等）
There are many factors / reasons accounting for this result.（accounting for现在分词作定语）
例句：There are many reasons accounting for my low test score. However, the following are the most typical ones. Firstly, I didn't review the lessons carefully. Secondly, I felt too nervous during the exam. Last but not least, I made some careless mistakes.
我的考试成绩低有很多原因。然而，以下是最典型的原因。首先，我没有认真复习功课。其次，我在考试时太紧张了。最后但同样重要的是，我犯了一些粗心的错误。
2.be responsible for: 造成…的原因
例句：There are many factors / reasons （that are）responsible for this instance, and the following are the typical ones.
造成这一情况有许多因素/原因，以下是典型的原因。
3.There are numerous reasons why + 句子, and here I shall explore only a few of the most important ones.
有许多原因导致为什么…。在此我想就最重要的几个探讨一下。
explore：探讨，调查研究
例句：There are numerous reasons why reading books is beneficial, and here I shall explore only a few of the most important ones.
读书有益的原因有许多。在此我想就最重要的几个探讨一下。
There are numerous reasons why exercise is essential for our health, and here I shall explore only a few of the most important ones.
锻炼对于我们的健康至关重要，原因有许多。在此我想就最重要的几个探讨一下。
4.句型：It seems to sb.that
It seems to me that … is not valued highly enough，the possible reason may be …
在我看来，对…的重视还不够，可能的原因或许是…
例句：It seems to me that the significance of historical heritage protection is not valued highly enough. The possible reason may be that in the process of rapid economic development, people are more concerned about short - term economic benefits, ignoring the long - term cultural and social value brought by historical heritage.
在我看来，历史遗产保护的重要性没有得到足够的重视。可能的原因是在快速经济发展的过程中，人们更关注短期经济效益，忽视了历史遗产带来的长期文化和社会价值。
5.There are similar reasons when we consider that + 句子.
当我们考虑…有一些相似的原因。
例句：There are similar reasons when we consider that people today spend less time on face - to - face communication. 当我们思考为什么如今人们面对面交流的时间越来越少，原因有相似之处。
6.It is easy to understand the reasons for this.One problem is that to most of us,+ 句子。造成这件事的原因很容易理解。问题是对我们大多数人来说…
One problem is that + 句子 （表语从句）
例句：It is easy to understand the reasons for this. One problem is that to most of us, environmental protection remains a concept rather than a daily habit.
这背后的原因很容易理解。其中一个问题是，对我们大多数人来说，环境保护仍然只是一个概念，而非日常习惯。
7.If … make so little sense, why have they been allowed to continue?
如果…没有什么作用，为什么它们还被允许继续？
make little sense：毫无意义，没什么用
例句：If single - use plastic bags make so little sense, why have they been allowed to continue?如果一次性塑料袋毫无意义，为什么还允许它们继续存在？
8.However, it is important to point out that + 句子.
然而，指出…是重要的。
It is important to point out that + 句子 （宾语从句）
例句： It is important to point out that reading books helps improve our knowledge.
需要重点指出的是，读书有助于增长知识。
9.Some reasons can explain this trend.First, … Secondly,…thirdly,…
一些原因可解释这一趋势。首先，… 第二，… 第三，…
例句：Some reasons can explain this trend. First, … Secondly,…thirdly,…
Some reasons can explain this trend of students using smartphones in class. First, smartphones provide quick access to learning materials. Secondly, various educational apps make studying more convenient. Thirdly, students can communicate with teachers and classmates instantly.
一些原因可以解释学生在课堂上使用智能手机的这一趋势。首先，智能手机能让学生快速获取学习资料。其次，各类教育应用程序使学习更加便捷。第三，学生可以即时与老师和同学交流。
10.This phenomenon exists for a number of reasons.First, ….Second, ….Third, …
这一现象的存在有许多原因。首先，… 第二，… 第三，…
exist for：存在于
例句：This phenomenon of people buying more online exists for a number of reasons. First, online shopping saves time and effort. Second, it often offers lower prices and more choices. Third, home delivery services make it extremely convenient.
人们更多地进行网购这一现象的存在有诸多原因。首先，网购节省时间和精力。其次，网购通常价格更低、选择更多。第三，送货上门服务使其极为便利。
11.There is probably a variety of reasons for the dramatic decline in ….
在…方面的突然下降或许有各种原因。首先，… 第二，… 最后，…
a variety of：各种各样
dramatic decline 急剧下降
例句：There is probably a variety of reasons for the dramatic decline in traditional letter - writing. One reason is the rise of instant messaging tools. Another is the convenience of email. Also, young people are more used to digital communication.
传统书信使用量大幅下降可能有多种原因。一个原因是即时通讯工具的兴起。另一个原因是电子邮件的便利性。此外，年轻人更习惯数字化交流方式。
12.Why did …? for one thing， ….For another, ….Perhaps the primary reason is …为什么会…？一个原因是… 另一个原因是… 或许主要原因是…
for one thing...for another：一方面，另一方面
例句：Why did the sales of printed newspapers drop sharply? For one thing, online news websites update information in real - time, providing quicker access to current events. For another, digital news is free or much cheaper than printed copies. Perhaps the primary reason is the convenience of reading news on mobile devices anytime and anywhere.
为什么纸质报纸的销量急剧下降？一方面，在线新闻网站实时更新信息，能让人更快获取时事。另一方面，数字新闻免费或比纸质版便宜得多。也许主要原因是在移动设备上随时随地阅读新闻十分便捷。
13.Perhaps it is due to the simple fact that + 句子
可能是因为一个简单的事实…
the simple fact that + 句子 （同位语从句）
例句： Perhaps it is due to the simple fact that he stayed up late last night, so he feels sleepy in class today.也许是因为他昨晚熬夜了，所以今天上课犯困。
14.It is fairly easy to find out the reason that + 句子
找出…的原因很简单。
the reason that + 句子 （同位语从句）
例句：It is fairly easy to find out the reason that students prefer online courses, which provide flexible learning schedules and abundant resources.
很容易发现学生偏爱在线课程的原因——它们提供了灵活的学习时间安排和丰富的学习资源。
15.Some obvious reasons for … are related to the fact that + 句子
有关…的一些显而易见的原因是和…事实有关。
the fact that + 句子 （同位语从句）
例句：Some obvious reasons for the decline in traditional postcard use are related to the fact that digital communication tools like emails and instant messaging are faster and more convenient.
传统明信片使用量下降的一些明显原因，与电子邮件和即时通讯等数字通信工具更快、更便捷这一事实有关。
16.The causes for … are varied.They include….Probably the main reason is that + 句子。引起…的原因各种各样。它们包括…可能其主要原因是…
Probably the main reason is that + 句子 （表语从句）
例句：The causes for the decline in reading interest among teenagers are varied. They include the popularity of electronic devices, the influence of fast - food culture, and the heavy academic burden. Probably the main reason is that the digital entertainment provided by electronic devices is more attractive and accessible to them.
青少年阅读兴趣下降的原因是多种多样的。它们包括电子设备的普及、快餐文化的影响以及沉重的学业负担。可能主要原因是电子设备提供的数字娱乐对他们来说更具吸引力且更容易接触到。
17.The failure mainly comes from several factors that + 句子
失败主要产生于一些…的因素。
factors that + 句子 （同位语从句）
例句：The failure mainly comes from several factors that include insufficient preparation, lack of teamwork, and poor time management.
这次失败主要源于几个因素，包括准备不足、缺乏团队协作以及时间管理不善。
18.Among the most important reasons offered by people for …, one should be mentioned.…人们给出的对于…最重要的原因中，有一个值得一提。
offered by people （过去分词作定语）
例句：Among the most important reasons offered by people for engaging in regular exercise, one should be mentioned: the improvement of physical and mental health.
在人们定期锻炼的众多重要原因中，有一点值得一提：改善身心健康。
19.Beyond these obvious reasons, however, lies a deeper cause.
在这些显而易见的原因之下,有着一个更深层的原因。