校园二手市场交易系统目标是为在校学生提供一个良好的交易平台。校园二手市场是指以经营旧货为主的交易市场。旧货包括旧的生产资料和生活资料,是指已进入生产消费和生活消费领域,处于储备、使用或闲置状态,基本保持原有使用价值的物品。-The goal of the the campus secondary market trading system is a good trading platform for students. Campus secondary market refers to the market-based operating thrift. Flea old means of production and means of subsistence, has entered the field of production and consumption and consumption in reserve, use or idle, keeping the original value items.