航天飞机执行了一项绝密使命，其军用装备由五角大楼控制。
The space shuttle undertook a top-secret mission with a military payload under Pentagon control.
按惯例，由三角形带中的第一个三角形定义其环绕。
The convention is that a strip's first triangle defines its winding.
换句话说，五角大楼和其承包商以完全不同的方式计算未来的成本。
In other words, the Pentagon and its contractor calculate future costs in completely different ways.
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