Complexity of missions, sensors used, weapons employed, and technology available have made this cockpit both necessary and possible.
任务的复杂性，传感器的使用，武器的选用，还有技术的成熟从必要条件和充分条件两个角度造就了这个座舱。
The list forms part of the Pentagon's set of approved weapons or "fires" that can be employed against an enemy.
这份目录构成五角大楼的一系列被批准的武器的一部分或是“开火”可以被应用于针对一个敌人。
The ancient race who employed such weapons must have existed before the use of iron, or any other metal, was known.
使用这些武器的人所处的时代肯定是在铁器时代或其它当时已知金属时代之前。
Railroads, the telegraph, steamships, and mass-produced weapons were employed extensively.
铁路，电报，轮船，和大规模生产的武器被广泛应用。
Railroads, the telegraph, steamships, and mass-produced weapons were employed extensively.
铁路，电报，轮船，和大规模生产的武器被广泛应用。
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