One day in computer class, a row of classmates' computers crashed. So a classmate stood up and said, "Teacher, the computer crashed, and our platoon was all dead." At this time, many students said, "We are dead, too." Then the teacher asked, "Who else is not dead?" Only one classmate stood up and said, "I'm not dead yet!" " "The teacher said strangely," the whole class is dead. Why don't you die? "