Work in apec and the free trade area of the americas ftaa to promote transparency and accountability in member countries procurement practices and seek apec and ftaa groups active support for singapore ministerial wto negotiations 今天我所讲的都与挑战及变化有关，但我以美国总统的身分向各位保证，有一件事依然不变，那就是美国承诺以实力、持续和良好的判断来领导世界。
