The wing sails with 3.1 percentage of essential wing area have observable efficiency in reducing induced drag. The factors of the induced drag were reduced by 20 percent.

总面积为3．1％基本翼面积的翼尖帆片对减少诱导阻力具有明显效果，诱导阻力因子减小20％左右。

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In this regard, the United States should initiate production and deployment of the B-2 "stealth" bomber whose "low observable" technology represents an area of significant competitive advantage for the United States.

CENTERFORSECURITYPOLICY: Center for Security Policy | An Assessment Of Future Requirements For US Strategic Forces And Strategic Arms Control

Now there are obviously going to be more factors than just parking spaces at play here, but certainly this is an observable phenomenon: go into any dilapidated inner city area and look around.

FORBES: Parking Lots Are a Waste of Space and a Drag on Growth