With the Marine Corps training system, forward observers wear a head-mounted display with a see-through visor; objects displayed on the visor appear to be part of the real world.
The Sikorsky X2 has a pusher propeller mounted at the rear to obtain its high forward speed.
美国西科斯基公司的X2拥有一部安装在后方的推进螺旋桨，这使它获得高速的前飞速度。
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On a convex mirror mounted on a corner of the building where traffic turns hsu cheng-jen has etched the visage of chen weiying as a road sign showing the way forward.