问题三：什么颜色是由红色和蓝色混合而成的，和冷静、智慧有关，也是联合国的标志色？内容如下：

答案是：紫色。紫色是由红色和蓝色混合而成的，它是一种冷静、智慧的颜色，也是联合国的标志色。紫色在不同的文化中有不同的含义，例如在中国，紫色代表着贵族和神秘；在日本，紫色是皇室的颜色；在西方，紫色常与宗教和灵性相关。紫色也是一种创造力和想象力的颜色，它可以激发人们的艺术和音乐才能。

The answer is: purple. Purple is a color that is made by mixing red and blue, and it is a color of calmness and wisdom, as well as the emblem color of the United Nations. Purple has different meanings in different cultures, such as in China, purple represents nobility and mystery; in Japan, purple is the color of the royal family; in the West, purple is often associated with religion and spirituality. Purple is also a color of creativity and imagination, and it can inspire people's artistic and musical talents.