例句：

　　據認為中國是第一農業(yè)大國。

　　It is thought that China is the biggest farming country.

　　中國是第一個(gè)也是唯一一個(gè)在傳統軌道線(xiàn)路上，擁有最高運營(yíng)時(shí)速達到350公里的商業(yè)高速列車(chē)運行服務(wù)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(gè)完成核準加強國際原子能機構保障監督附加議定書(shū)的有關(guān)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.