The military has begun a rotation of forces in Iraq and Afghanistan that amounts to the largest movement of American troops in decades.

• 为了缓解军队持续作战的压力,美国军方近日在伊拉克和阿富汗进行了一次规模巨大的换防。这是美军数十年来规模最大的军事调动。外电中有这样的报道