messages.content: 对给出的句子判断其主题,以{"LABEL": label}的格式作答。短文以sentence:<>格式给出,可选择的类别有: story, culture, entertainment, sports, finance, house, car, edu, tech, military, travel, world, stock, agriculture, game.
messages.role: system
messages.content: sentence:<哪些汽车用品不适合网购？>
messages.role: user
messages.content: {"LABEL": tech}
messages.role: assistant