万圣节起源于古代凯尔特人的节日，他们认为这一天亡灵会回到人间。现在，人们会化妆、挂鬼脸，狂欢庆祝这个节日。The origin of Halloween dates back to the ancient Celtic festival, when they believed that on this day, the dead would return to the world. Now, people dress up, put on scary faces, and celebrate this holiday.