考研英语难句主要表现在以下几个方面：
1. 长句：句子结构复杂，包含多个从句，如定语从句、状语从句等，使得理解起来较为困难。
2. 混合句：将简单句和并列句混合在一起，使得句子结构更加复杂，理解难度增加。
3. 难词：句子中包含一些生僻、专业或抽象的词汇，增加了理解难度。
4. 逻辑关系：句子中的逻辑关系不明显，需要仔细分析才能理解。
5. 修辞手法：句子中运用了各种修辞手法，如比喻、拟人等，使得句子更加晦涩难懂。
以下是一些考研英语难句的例子：
1. The rapid development of technology has brought about numerous benefits to our society, which can be seen in the improvement of our living standards, the advancement of our medical care, and the enhancement of our educational systems.
2. Although it is widely believed that the Internet has revolutionized the way we communicate, some people argue that it has actually led to a decline in the quality of our social interactions.
3. In order to achieve sustainable development, we must strike a balance between economic growth and environmental protection.
4. Despite the fact that the government has implemented various policies to reduce pollution, the air quality in many cities remains poor.
5. The author suggests that the key to success lies in perseverance and hard work.
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