But was an extra photopigment all that was needed to evolve trichromatic vision? 但是是否另一種感光色素必須完全進(jìn)化成三色視覺(jué)？
In this view, trichromatic color vision can be considered a hobby of the preexisting spatial vision system. 或許也沒(méi)有這個(gè)必要，如果從這角度來(lái)看，我們可以把三色視覺(jué)看成既有空間視覺(jué)系統的次要活動(dòng)。
A certification of colour vision shall be valid for a maximum period of six years. 色覺(jué)視力證書(shū)的最長(cháng)有效期應為六年。
Our experiments provided evidence that birds use all four cones in their color vision. 我們的實(shí)驗證明，鳥(niǎo)類(lèi)的色覺(jué)使用了所有四種錐細胞。
