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.
中國是第一個也是唯一一個在傳統(tǒng)軌道線路上，擁有最高運營時速達到350公里的商業(yè)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(jiān)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.