1、Tenthly, I would like to express my deep gratitude to all the volunteers who have contributed to this project.
第十，我想向所有为这个项目做出贡献的志愿者表达我深深的感激之情。
2、Tenthly, I would like to address the issue of environmental sustainability.
第十，我想讨论环境可持续发展的问题。