A team of researchers trained three Rhesus monkeys to associate 26 clearly different symbols consisting of numbers and selective letters with 0-25 drops of water or juice as a reward.

一支科研队伍训练了三只恒河猴，他们用数字和经过挑选的字母组成 26 个明显不同的符号，让这些猴子将这些符号与 0-25滴水或者果汁的奖励联系起来。