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以下是一篇400字左右的同学范文：

如何平衡学习和娱乐

当代学生在学习和娱乐之间面临着很大的平衡难题。学习的压力和社交媒体的诱惑让他们很难找到一个平衡点。然而，平衡学习和娱乐是非常重要的，因为这能够帮助学生更好地管理时间，保持积极的心态，提高学习效率和享受生活。

首先，学生应该意识到学习和娱乐的重要性。虽然学习是他们的主要任务，但娱乐也是必要的。无论是体育运动、音乐、电影还是旅游，娱乐活动都能帮助学生放松身心，缓解学习压力。此外，娱乐也能帮助学生培养兴趣爱好，促进个人成长。

其次，学生需要制定合理的学习和娱乐计划。通过制定科学的学习计划，学生可以充分利用时间，提高效率，减少浪费时间的情况。同时，学生也应该计划自己的娱乐时间，包括看电影、听音乐等。这可以使学生更好地控制时间，不会影响学习进度。

另外，学生也需要选择有价值的娱乐方式。这就意味着，他们应该选择一些有益于身体和心理健康的娱乐方式，例如户外运动、舞蹈、阅读等。与此同时，学生也应该避免过度依赖社交媒体和电子游戏等不健康的娱乐方式，以免对学习产生负面影响。

最后，家长和老师也应该给予帮助和支持。他们可以鼓励学生积极参加有益的娱乐活动，并定期检查学生的学习进度和表现，帮助他们更好地调整学习和娱乐之间的平衡。

总之，学生需要认识到学习和娱乐的重要性，制定科学的学习和娱乐计划，选择有价值的娱乐方式，以及得到家长和老师的支持和帮助。这将帮助他们更好地平衡学习和娱乐，使他们能够更快乐、健康地成长和学习。

以下是一篇关于环保的英语作文:

Protecting the Environment

The environment is a system that supports the survival and reproduction of living things. It is also the foundation of human society. However, with the development of industry and the increase of population, environmental pollution has become a thorny issue all over the world. In order to protect the environment, we should take effective measures to reduce pollution.

First of all, we should act more environmentally friendly in our daily life. For example, we can turn off lights and unplug electronics when we are not using them. We should also be more mindful of reducing waste and recycling as much as we can. Secondly, we should use environmentally-friendly products. Using eco-friendly bags, products and transportation can significantly reduce the impact of human activities on the environment.

Moreover, it's important to promote public awareness of environmental protection. Schools and governments should organize activities that educate people about the importance of environmental protection and encourage them to participate in environmental conservation programs. By promoting green and sustainable living, we can create a society that values the environment.

In addition, we need to enhance environmental protection laws and regulations. Governments should formulate, implement and improve environmental protection laws and regulations to punish companies or individuals who break environmental protection laws and regulations. We need to create a social atmosphere of environmental protection in which everyone understands the importance of environmental protection and is willing to protect the environment because of their own interests.

In conclusion, environmental protection is of great importance to the survival and development of human beings. We should all make an effort to reduce pollution, use environmentally-friendly products, and promote public awareness of environmental protection. Everyone plays a role in creating a green and sustainable world.