考研英语中的长难句通常包含以下几个特点：
1. 复杂的主谓宾结构：句子中主语和谓语之间的关系可能非常复杂，可能涉及从句或非谓语动词。
例如：“The rapid technological advancements in recent years have significantly altered the landscape of modern communication, leading to a more interconnected and interdependent global society.”
2. 多重从句：句子中可能包含多个从句，如定语从句、状语从句、同位语从句等。
例如：“The issue of climate change, which is a result of human activities, has become a critical concern for global sustainability.”
3. 插入语：句子中可能含有插入成分，这些成分通常用逗号隔开，不影响句子的主要结构。
例如：“Despite the challenges that we face today, there is no doubt that our future will be shaped by the decisions we make now.”
4. 不寻常的词序：英语中通常主语在谓语之前，但在某些长难句中，词序可能颠倒，以强调某个部分。
例如：“It is through the collaborative efforts of scientists, engineers, and policymakers that we can hope to achieve a sustainable energy future.”
5. 难懂的词汇：长难句中可能包含一些专业性或学术性的词汇，需要考生具备一定的词汇量。
例如：“The utilization of renewable energy sources, such as wind and solar power, is essential for reducing our carbon footprint and combating climate change.”
掌握这些特点，可以帮助考生在阅读和解析长难句时更加得心应手。
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