European countries have many taboos about numbers, colors, flowers and animals. Westerners generally taboo 13 and Friday because of Christian legend; many western countries regard black as the expression of funeral; in international occasions, it has become a convention to avoid using chrysanthemum, azaleas, carnation, and yellow flowers for guests; In addition, animal patterns such as elephant, peacock and crane are also listed in the list of taboo in some western countries, which are regarded as the pronouns of stupid (Britain), adulteress (Britain, France) and fool (France).