n germany has been preserved and i asked the children: are there any cities?they answered: yes.big cities， too.berlin， too.
以德国的经验，城市留着跳蚤市场非常必要，再现代的城市都有集市贸易，百姓在规定的日子，可以摆摊卖自己的东西，现代化是一种生活方式更加人性化，我在德国的施瓦本哈尔看到非常有趣的跳蚤市场，东西五花八门，谁都可以摆地摊卖东西，但是非常干净……不会给街道留下打扫不完的后患……
with the experience of germany， it is necessary for the city to keep a flea market. there is a market trade in modern cities. the people can sell their own things on a set day.modernization is a more humane way of life. i see a