未来三年，中国计划修建30个机场和3000公里铁路。
In the next three years, China plans to build 30 airports and 3, 000 km of railways.
第二步：阐明对未来三年美国经济的宏观预测。
Step two: lay out a three-year macro forecast of the US economy.
预计未来三年公共开支增长，会继续高于本地生产总值增长。
The growth of expenditure will continue to outstrip GDP growth in the next three years.
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