coefficient of relative blackness相对: opposite; face to face度: surmise; estimate系数: coefficient; ratio; modulus; ...相对黑度: blackening, relative; relative blackening; relative blackness相对黑度 比较黑度: relativeblackness下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:相对黑度系数，即可在微信中查询翻译
