Question

尊敬的各位领导老师 同学们 大家下午好用英语怎么说

Answer 1

My honored leaders,teachers,fellow school mates, good afternoon.

不过你如果英文演讲搞的这么中式化,感觉太累赘了. 还不如直接简单点,比如： Hello, everyone! Good afternoon, everyone!