国外有人做过这样的实验 :从同一只西瓜中取出两杯西瓜汁 ,把其中一杯染成红色 ,结果绝大多数品味者都感到这杯西瓜汁要比另一杯甜。原来 ,人类的大脑经过长期生活经验的积累 ,形成了一种条件反射 ,看到西瓜汁的红色 ,就很自然地和甜美可口及多汁的水果联系起来。同样是“酱汁 Someone abroad has done experiments like this: taking two cups of watermelon juice from the same watermelon and one of them into a red cup. The result is that most taste makers feel this cup of watermelon juice is more sweet than another cup. It turned out that the human brain after long-term life experience accumulated, forming a conditioned reflex, see the watermelon juice red, it is naturally sweet and delicious and juicy fruit linked. The same is "sauce