例句：

　　據認為中國是第一農業大國。

　　It is thought that China is the biggest farming country.

　　中國是第一個也是唯一一個在傳統軌道線路上，擁有最高運營時速達到350公里的商業高速列車運行服務的國家。

　　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，中國是五核國中第一個完成核準加強國際原子能機構保障監督附加議定書的有關國內法律程序的國家。

　　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.