如果从现在开始到2015年采取循序渐进的方式，把中等教育向每个儿童普及的花费将有可能以每年270亿美元至340美元的速度增加。
If a gradual approach is taken between now and 2015, the annual additional cost of extending secondary education to every child will likely be between $27 billion and $34 billion.