长江是中国最长的河流之一，也是世界上最长的河流之一。它穿过中国的多个省份，为数亿人提供了水源和经济资源。然而，随着全球气候变化的影响，长江的冰封现象越来越少见。据历史记录显示，长江已经有数十年没有完全结冰了。

The Yangtze River is one of the longest rivers in China and also one of the longest in the world. It flows through multiple provinces, providing water resources and economic opportunities for hundreds of millions of people. However, with the impact of global climate change, the phenomenon of the Yangtze River freezing over has become increasingly rare. Historical records show that it has been several decades since the river last completely froze over.

气候变化是导致长江结冰减少的主要原因之一。随着地球变暖，全球平均气温不断上升，这导致了在寒冷季节中产生足够低温的机会变得越来越少。冰冻时间缩短和温度上升的结果是，长江的结冰现象发生的频率和程度都在逐渐减少。

Climate change is one of the main reasons for the decrease in ice formation on the Yangtze River. As the Earth warms up and global average temperatures continue to rise, opportunities for sufficiently low temperatures during the cold season have become increasingly scarce. The result of shorter freezing periods and rising temperatures is that the frequency and extent of ice formation on the Yangtze River have gradually decreased.

人类活动也对长江结冰产生了一定的影响。随着经济的发展和城市的扩张，大量的工业废水和污染物排放进入了长江。这种污染物会降低水体的凝固点，使其更难结冰。此外，水库的建设和水位调节也会改变长江的流动，进一步影响冰的形成。

Human activities have also had an impact on ice formation on the Yangtze River. With economic development and urban expansion, a large amount of industrial wastewater and pollutants are discharged into the river. These pollutants lower the freezing point of the water, making it more difficult for ice to form. Additionally, the construction of reservoirs and water level regulation also alters the flow of the Yangtze River, further affecting ice formation.

长江多年没有结冰的现象对当地人民和生态系统产生了深远的影响。首先，冰封可以提供临时的陆路交通，而现在这一便利不再存在，给居住在该地区的人们带来了不便。其次，冰封还能够阻止水体的蒸发，保持水质稳定，维持水生态系统的平衡。没有结冰，河流的生态环境面临更多的挑战。

The phenomenon of the Yangtze River not freezing over for many years has had profound effects on local people and ecosystems. Firstly, ice formation used to provide temporary land transportation, which is no longer available, causing inconvenience to those living in the area. Secondly, ice cover prevents water evaporation, maintains water quality stability, and preserves the balance of aquatic ecosystems. Without ice formation, the river's ecological environment faces more challenges.

为了应对长江结冰减少的问题，需要采取综合的措施。首先，加强全球气候变化的监测和应对，减少温室气体排放，降低地球表面温度上升的速度。其次，加强水污染治理和废水处理，减少对长江水质的污染。此外，合理规划水利工程，保持长江的自然流动，有助于恢复河流的生态功能。

To address the issue of decreased ice formation on the Yangtze River, comprehensive measures need to be taken. Firstly, strengthening global climate change monitoring and response, reducing greenhouse gas emissions, and slowing down the rate of temperature rise on Earth. Secondly, enhancing water pollution control and wastewater treatment to reduce pollution to the water quality of the Yangtze River. Additionally, proper planning of water conservancy projects and maintaining the natural flow of the river will help restore the ecological functions of the Yangtze River.

In conclusion, the Yangtze River has not completely frozen over for many years, primarily due to climate change and human activities. This phenomenon has significant impacts on local communities and ecosystems. It is crucial to implement comprehensive measures to address the issue and preserve the ecological health of the Yangtze River.

总结：由于气候变化和人类活动的影响，长江多年来没有完全结冰。这对当地社区和生态系统产生了重要的影响。为了解决这一问题并保护长江的生态健康，实施综合措施至关重要。