philosophize
verb [ I ] mainly disapproving (UK usually philosophise) uk/fɪˈlɒs.ə.faɪz/ us/fɪˈlɑː.sə.faɪz/
高谈阔论;卖弄大道理
to talk for a long time about subjects such as the meaning of life
Students, she complained, had nothing better to do than spend whole days philosophizing about the nature of truth. 她抱怨说，学生们除了整天空谈什么真理的本质外，就再也没有什么更好的事情可做了。