Those who build software for air traffic control systems, for example, need certain work products to ensure multiple reliability checks, regulatory compliance, and so forth.
例如，构建空中交通管制系统的软件需要某些工作产品以确保多重可靠性检查，满足可调整性等等。
2
So when a guest checks out of a hotel the receptionist can adjust the air-conditioning to stop it needlessly chilling the furniture.
这样当客人付账离开旅馆时，接待员就可以调节空调使其不至于毫无用处的冷却家具。
3
But with civilian air traffic shut down, the transportation and clearing of good old-fashioned checks were being delayed.