例句：
据认为中国是第一农业大国。
It is thought that China is the biggest farming country.
中国是第一个也是唯一一个在传统轨道线路上，拥有最高运营时速达到350公里的商业高速列车运行服务的国家。
China is the first and only country to have commercial high-speed train service on conventional rail lines that can reach a top operational speed of 350 km/h.
此外，中国是五核国中第一个完成核准加强国际原子能机构保障监督附加议定书的有关国内法律程序的国家。
China is also the first among the five nuclear-weapon states to have completed the legal procedures for the entry into force of the Additional Protocol to its Safeguards Agreement with the IAEA.