张衡又是一位机械工程师，制造过能飞的“木雕”和能计算里程的“计里鼓车”等。
Zhang Heng was also a mechanical engineer, and made a flying "wooden eagle"and a "mileage-counting drum-cart".
只要将美国舰队的每加仑汽油的航行里程增加1英里，每年就会节省61亿加仑汽油，以今天的价格计算，价值170亿美元。
Simply improving the mileage of the U.S. fleet by one mile per gallon would save 6.1 billion gallons of gas per year, or $17 billion at today's prices.
计划 —— 定义项目战略，包括开发和交付项目计划、计算总规模和各个部分的规模、定义工作进度表和为主要检查点建立里程碑。
Planning - Define a strategy to develop and deliver a project plan, calculate overall and detailed sizing, define a work schedule, and establish milestones for major checkpoints.
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