They have more difficulry in aggreeing on what characterizes a "good" teacheThey have more difficulry in aggreeing( on what) characterizes a "good" teacher.on是介词,后面怎么接了what从句?这是什么用法?没有连接词也可以加从句?

They have more difficulry in aggreeing on what characterizes a "good" teacheThey have more difficulry in aggreeing( on what) characterizes a "good" teacher.on是介词,后面怎么接了what从句?这是什么用法?没有连接词也可以加从句?
They have more difficulry in aggreeing on what characterizes a "good" teache
They have more difficulry in aggreeing( on what) characterizes a "good" teacher.
on是介词,后面怎么接了what从句?
这是什么用法?没有连接词也可以加从句?

They have more difficulry in aggreeing on what characterizes a "good" teacheThey have more difficulry in aggreeing( on what) characterizes a "good" teacher.on是介词,后面怎么接了what从句?这是什么用法?没有连接词也可以加从句?
what = the thing that 引导名次性从句

They have more difficulry in aggreeing on what which characterizes a "good" teacher.
英文要是依靠中文全能整明白，会中文的就都成了英文天才了！

aggreee on 是个词组，aggreeing加ing是因为in是介词，介词后的动词要加ing。what characterizes a “good” teacher，是个讨论的主题。
翻译如下。他们很难在“怎样定义一个好老师”的问题上达成协议。