洛克希德·马丁公司的持续威胁探测系统是一个长时间的高举的氦气填充的系留气球的设计，这种设计是为了提供广泛的监视领域。
Lockheed Martin's Persistent Threat Detection System is a tethered aerostat filled with helium designed to stay aloft for long periods of time to provide surveillance of broad areas.
洛克希德·马丁公司的持续威胁探测系统是一个长时间的高举的氦气填充的系留气球的设计，这种设计是为了提供广泛的监视领域。
Lockheed Martin's Persistent Threat Detection System is a tethered aerostat filled with helium designed to stay aloft for long periods of time to provide surveillance of broad areas.
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