What is yellow white dichromatic symbol rice said " silver cakes " and " annual high " homophonic meaning the people 's life and work to improve each year .

年糕有黄、白两色，象征金银，年糕又称“年年糕”，与“年年高”谐音，寓意着人们的工作和生活一年比一年提高。

However , the results from several empirical studies have called into question the extent to which trichromacy functions in foraging and if it provides a performance advantage over dichromatic primates ( who lack red-green color vision ) .

然而，几项经验性研究对三色视觉究竟在何种程度上有助觅食，以及与二色视觉灵长类（没有红-绿视觉）相比究竟有无实际优势提出了质疑。