Welcome to the unit & Reading P21-25
1. protect/preserve the environment for future generations为子孙保护/拯救环境
2. have/hold a debate (on/about/over sth) 进行辩论 debate with sb. on/about/over sth. 和某人辩论某事
under debate 在辩论中 beyond debate/There is no debating that…无可争辩