3. Dressing up in costumes is one of the most popular Halloween customs, especially among children. According to tradition, people would dress up in costumes (wear special clothing, masks or disguises) to frighten the spirits away.

　　Dressing up in costumes是最受欢迎的万圣节风俗之一，尤其是受孩子们的欢迎。按照传统习俗，人们会dress up in costumes（穿戴一些特別的服裝，面具或者装饰）来吓跑鬼魂。