英语辩论作文的结尾部分应该简洁有力，能够有效地总结观点并给评委和听众留下深刻印象。以下是一些常见的结尾方式：

自然结尾：

直接点明主题，使结尾显得自然流畅。例如：

"In conclusion, the importance of environmental protection cannot be overstated."

首尾呼应：

在结尾处用含义较深的话点明主题，深化主题，起到“画龙点睛”的效果。例如：

"As we reflect on the journey we have taken, it is clear that our commitment to sustainability is not just a choice but a necessity for the future of our planet."

反问结尾：

以问句的形式结束，但意义却是肯定的，能够引起他人的深思。例如：

"How can we ignore the urgent need to protect our environment when the very air we breathe is at stake？"

总结分论点：

如果文章涵盖了多个论点，最好在结尾时对这些分论点进行总结。例如：

"In summary, while the benefits of technology are undeniable, we must also recognize its potential to harm our society. It is our responsibility to find a balance between innovation and responsibility."

重申观点：

重申文章的主要论点，强调其重要性。例如：

"Therefore, it is imperative that we adopt sustainable practices to ensure the well-being of future generations."

根据具体的辩论主题和论点，可以选择最适合的结尾方式，使作文在结束时显得有力且令人印象深刻。