There are several reasons for the phenomenon.
The causes for the phenomenon, which are quite obvious, can be listed as follows.
The answer to this problem involves many factors.
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列举影响 分析原因 发表观点
列举影响
Topic sentence (产生影响)
It will exert a profound influence.
There are a number of effect.
The positive/negative effects, which are widely accepted, can be listed as follows.
Besides, the environmental pollution is another important cause. The rapid development of science and technology, the population explosion and large-scale industrial production have resulted in serious environment pollution which cause the imbalance of ecology.
To begin with, … To make matters worse, … The worst of all, …
Topic sentence 环境污染对人有影响 概括的影响1 水污染对人的影响，举例 概括的影响2 大气污染对人的影响，举例 概括的影响3 森林退化对人的影响，举例
The fake commodities would sabotage the nation. The poor quality, sometimes even poisonous food is threatening people’s life. Nobody would deny that the issue of milk powder will happen again, if the concern is not raised over the food security. In addition, ……
The picture reveals a fact that nowadays a growing number of students is willing to study abroad.
Topic sentence(原因) Examples
Why is there an increasing popularity of studying abroad ?
The reasons for the fact, at least to me, are not difficult to find.
A number of factors could account for the problem.
The factors that contribute to the phenomenon include…
The negative effects, which are generally acknowledged, are presented below.
… is harmful/beneficial in more than one way.
It leaves some serious consequences
层次过渡句
原因1 The most important reason
cited by people is …
One of the most popular reasons is …
原因2 Another important reason
is …
Also playing a part is …
In addition,… is also responsible for the phenomenon
It may give rise to a host of problems
过渡句1
The immediate result it produces is …
Perhaps the most serious consequence is …
过渡句2
e influence is not confined to what is mentioned above. What’s more?
原因3
The third reason, which can not be neglected, is that…
Due to various reasons, the ecological balance has been destroyed seriously. In current commercial society, people have taken all kinds of measures to pursue profits, as a result of which, over-fishing has become a prevalent practice. Once it is reported that in a certain river, the limit of fishing was 5000 tons per year, however, the real amount was far beyond the limit.
分析原因
Topic sentence Why …? What has caused the …?
What on the earth are the reasons for the phenomenon?
What in the world is responsible for the problem?