The costs became obvious in the late 1960s, during the Vietnam War, when heavy purchases of relatively inexpensive foreign goods -- and increased foreign and military aid -- caused many dollars to flow out of the country.

• 这一影响在60年代越南战争期间变得很明显，那时人们大量购买比较便宜的外国商品，加上对外军事援助的增加，引起大量美元外流。