That includes things like ammunition, armored vehicles and unmanned aircraft systems.

这包括弹药、装甲车和无人机系统。

The university has flown and researched unmanned aircraft systems for years. But now, the research has more meaning.

该大学多年来一直在飞行和研究无人驾驶飞机系统。 但现在，这项研究有了更多的意义。

This engine is not connected to the aircraft's systems and would not be able to  provide additional power to the jumbo jet.

该发动机未连接到飞机的系统，因此无法为大型喷气式飞机提供额外的动力。

Research has shown personal electronic devices can emit a signal within the same frequency band as the aircraft's communications and navigation systems, creating what is known as electromagnetic interference.

研究表明，个人电子设备可以发射与飞机通信和导航系统相同频段的信号，产生所谓的电磁干扰。

Investigators remained keen to find the second black box, the flight data recorder, which should contain detailed information about what the aircraft's control systems were doing in the run-up to the crash.

调查人员仍然迫切地想要找到第二个黑匣子，也就是飞行记录器，其中应该含有飞机坠毁过程中控制系统的详细信息。

It could also potentially become  an issue if there's a problem with the aircraft's fuel pump system. As the  fuel source is located below the engines, the tail-mounted engines cannot  make use of gravity to self-feed.

如果飞机的燃油泵系统出现问题，也可能成为问题。由于燃料源位于发动机下方，尾部安装的发动机无法利用重力自行供油。

Although four-engine operation would be more efficient, upgrading the airframe to run with only four engines would necessitate further alterations to the aircraft's systems and control surfaces especially the rudder, extending the project's duration, cost, and complexity.

尽管四引擎运行效率更高，但将机身升级为仅使用四引擎运行将需要对飞机的系统和控制面（尤其是方向舵）进行进一步改造，从而延长了项目的持续时间、成本和复杂性。