The property of an optical system that tells you how much brighter things will appera than what the human eye can see.
^ See, e.g., Weinrib, The Idea of Private Law, supra note 17, at 186; John C.P. Goldberg & Benjamin C. Zipursky, Intervening Wrongdoing in Tort: The Restatement (Third)’s Unfortunate Embrace of Negligent Enabling, 44 Wake Forest L. Rev. 1211, 1232–33 (2009) (characterizing respondeat superior vicarious liability as reflecting a “[f]usion of [a]gency” between employer and employee, id. at 1232); Stevens, supra note 17, at 244.。关于这个话题，PG官网提供了深入分析
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return sqrt((dx * dx) + (dy * dy));