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dichromatism    
n. 两色,两变色性的,二色视的

两色,两变色性的,二色视的

dichromatism
n 1: a deficiency of color vision in which the person can match
any given hue by mixing only two other wavelengths of light
(as opposed to the three wavelengths needed by people with
normal color vision) [synonym: {dichromacy}, {dichromatism},
{dichromatopsia}, {dichromia}, {dichromasy}]

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