In many cultures white is often associated with something positive. A white collar job, for instance, is the kind of job many people look for, working with your brain and not your hands. White has a clean and pure image. That is why doctors, dentists, and nurses usually wear white uniforms. Babies are dressed in white at baptisms(洗礼) and brides wear white wedding gowns at weddings. White in these cases is the symbol of innocence or purity. Sometimes white is used in expressions that are not good