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__________________。
Perhaps this is because of the simple fact that..... 也许，原因很简单，亦即_____________________。
One of the premier causes is that(注意用词) 最重要的原因之一便是______________。
At the risk of sounding too simplistic, it seems to me that the main propositions can be summarized in one saying.
We may look into every possible reason, however, foremost reason for .... Is ....
It might also be noted that.... 需要注意的是，____________。
Another reason why .....(凑字数，但不可滥用) is that....(有利于写长句)
What is also worth noticing is that....值得一提的是___________________。
There is another factor that deserves some words here. 还有另外一个很重要的原因。
A more essential factor why.... Is that ________ 的更为重要的原因是____________。
A further reason why,,,, is that..... ________的更深层次的原因是____________。 In addition..此外，再者
Moving on to wider themes,_______ 展开来说，_________________________。
The second thing that must be taken into consideration is that... 第二个原因也很重要(值得考虑)，亦即__________。
Likewise(同样), common sense tells us that... 同样，___________，这是众所周知的。 The third but very important reason is that...
第三个(尽管不是很重要)原因是______________。 The third, not the last is that, 第三个原因是___________。
The last factor to be taken seriously is... 第三个重要原因是_______________。 Finally, moreover, last but not least, furthermore.
As the proverb goes: "every coin has its two sides", ....is no exception.俗语有云："万事万物都有两面性。" ________也不例外。
Every thing has a good side and a bad side, and ....is no exception. 万事万物有其两面性，而________也是如此。
The discussion as to whether the ... is a blessing or a curse arouses most people's interests. __________是好坏利弊问题引起了很多人的兴趣。 plays such an important role that it undeniably becomes the biggest concern of the present world. ___ 尤为重要而引起当今社会的关注。 There comes a question: is it a blessing or a curse. 问题是：____是福是祸?
There is no denying that every thing has one more face and ... is no exception. 不可否认，每一件事物都有其两面性，其实，______也不例外。 Every thing in the world has its own two sides. Without exception, A has both advantages and disadvantages. 任何事情都有两面性，A也不例外，有其优势和劣势(利与弊)。 ..undoubtedly plays an increasing significant role in modern life.
不容置疑，_______在现代生活中不断显示出起重要性。 With the development of the society, ... is increasingly important.
随着社会的发展，_______变得越来越重要。 The merits of this is obvious... 其好处显而易见。
As we know, ... bring many benefits and convenience to people. 众所周知，_______ 为我们的生活带来很多好处。
There are no less than three advantages in .. as rendered below.如下所示，_______ 至少有三种好处。
Despite the advantages ... has, some people claim, we shall not lose sight of its adverse effects on...
However, like anything else,... has more than one face. 然而，象其他任何事物一样，______ 还有其它的方面。
However, with the advance of the human civilization, there is an increasing number of people who have raised doubts about whether... 然而，随着人类文明的进步，越来越多的人开始置疑是否__________。
Some people deem it is a dangerous signal and call for public awareness of the negative effects it has brought about.
Of course, nothing in the world is perfect, so is... 当然，时间没有完美的事物，所以，________。 Despite its merits, it also brings some problems to solve. 尽管其也有很多优点，不过，也给我们带来一些问题。
But its bright side should not keep us from examining its dark side. 但是，我们不能因为这些优点而忽略了其缺点。
From the reasons presented above, I think the pros outweigh the cons. 从以上原因可以看出，其优势胜过劣势(优点多于缺点)。
As far as I am concerned, its disadvantages outweigh its disadvantages. 我认为，其优势胜于劣势。
总的说来：In general, all in all, on the whole , in brief, in summary, in conclusion, in short, in a word , to sum up, to conclude, to summarize,...
But all in all, I would say the advantages outweigh the disadvantages. With the advance of society, if we encourage the merits and eliminate the drawbacks, all people will enjoy a better life.
From what has been discussed above, we may finally draw the conclusion that... 通过以上的讨论，我们可以得出如下结论，___________。 So, as I see it.. 因此，我个人认为，_________。
What we must do is to encourage the strength and diminish the weaknesses to the least extent.
In conclusion, although ... has its negative effects, it can to a great extent bring us more advantages.
From what has been discussed above, we can see ... does more harm than good to us. Therefore, I strongly approve of the motion that... 从以上论述可知，_____ 对我们百害而无一利。"比如"的表达方式： For example, For instance,
It can be given a concrete example, Take ... for an example, it is a very obvious case There is one impressive example I want to mention here.
Perhaps the most important example of ...is that...
To illustrate this, there is an example that is very persuasive.
An instance that accompanies this reason is that...
An example can give the details of this argument, ...
It is a forceful example to demonstrate the importance of ...
History presented many examples of...
In order to see this point clearly, let us see an example.