通过对欧氏第五公设的试证，引入罗氏几何与黎氏几何。
We introduce the Lobachevskian geometry and the Ricmanian geometry by proving the Euclidean of the fifth postulate.
当志工是种震撼的学习，今年，黎静和罗小宁选择用行善丰富今年的暑假生活，她们的心收获很大。
Serving as a volunteer is a powerful lesson; this year, Li Jing and Luo Xiaoning have given over their own summer lives in charity to others. They have found themselves enriched.
欧洲中部时间下午五点过后不久，法比奥。卡纳瓦罗和罗那尔迪尼奥在苏黎士歌剧院的记者室就座。
Shortly after 5 pm CET, Fabio Cannavaro and Ronaldino took their seats in the press room of the Zurich Opera House.
欧洲中部时间下午五点过后不久，法比奥。卡纳瓦罗和罗那尔迪尼奥在苏黎士歌剧院的记者室就座。
Shortly after 5 pm CET, Fabio Cannavaro and Ronaldino took their seats in the press room of the Zurich Opera House.
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