欧文斯和奥尔森假设，如果类胡萝卜素是稀有的或对健康有要求的，则通过着色指示的类胡萝卜素的存在在配偶选择的背景下将是有意义的。
Owens and Olson hypothesize that the presence of carotenoids, as signaled by coloration, would be meaningful in the context of mate selection if carotenoids were either rare or required for health.
它喜欢吃草、兔粮、胡萝卜、白萝卜和其它的绿色蔬菜。
It likes eating the grass, rabbit food, carrots, white radish, and other green vegetables.
医生们以胡萝卜籽和胡萝卜根为药，其依据是味道不好的食物对你一定有益。
Doctors used carrot seeds and roots as medicine on the theory that foods that taste bad must be good for you.
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