In one type of squirrel monkey, the males lack a visual pigment called L-opsin.Its absence renders the monkeys color-blind, unable to distinguish reds and green.是什么意思_In one type of squirrel monkey, the males lack a visual pigment called L-opsin.Its absence renders the monkeys color-blind, unable to distinguish reds and green.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句