如果布什总统的部队“急流”不能交出一份可以称作“胜利”的答卷，那么美国可以从中为其未来的对外政策吸取什么样的教训呢？
If President George W. Bush’s current troop “surge” fails to produce an outcome that can be called “victory,” what lessons will the United States draw for its future foreign policy?