无线传感器需要能量才能工作，同时还需要对电池的维护，经济可承受的电池替换以及安全的电池处理方法。
Wireless sensors require energy to operate, and battery maintenance, economic battery replacement, and safe battery disposal are barriers.
为解决武器装备全寿命周期费用高、经济可承受性差的难题，开展航空装备的故障预测技术研究。
To reduce the entire life cycle cost of weapon system and enhance their affordability, technology of fault prediction is studied for aeronautic equipment.
从经济可承受性、进度、海上作战需求和航母适配性等方面，论述F-22未能成为舰载战斗机的原因。
The reasons why F-22 hasn′t converted into a carrier-based aircraft are presented, which include affordability, progress, maritime operation requirements and adaptation and so on.
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