“公开” adj. open; public; overt（Source: 《新世纪汉英大词典》）
“开庭” v. open a court session（Source: 《新世纪汉英大词典》）
“审理” v. hear; try（Source: 《新世纪汉英大词典》）
“公开开庭审理” n. in open court; open trial

新闻例句

济南市中级人民法院8时43分一审公开开庭审理被告人薄熙来受贿、贪污、滥用职权案。 （Source: 新华网）

Defendant Bo Xilai stood trial in an open court at the Jinan Intermediate People's Court at 8: 43 am on charges of bribe-taking, embezzlement and abuse of power.