viewing , riant
词根： eye
eyeless 盲目的；无眼的；瞎的
eye 眼睛；视力；眼光；见解，观点
eye 注视，看
The air combat visual has a characteristic that the eyeable airspace is big (more than 20 kilometers) but target is small (all fighter plane is small in 30 meters).
空战仿真视景具有可见空域大(20公里以上)而靶标小(战机均小于30米)的特点。
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