expatiate/ɪkˈspeɪʃɪeɪt; ɪk`speʃɪˌet/ v[Ipr]~ on/upon sth (fml 文) write or speak at great length or in detail about a subject 详述; 细说; 阐述 The chairman expatiated for two hours on his plans for the company. 董事长用两小时阐述了公司的规划.
牛津英汉双解词典