The legal system of circular economy in Germany Development of circular economy in China On the legal system of ecological security in river basin Fundamental issues of circular economy law 并列题名：On the legal system of ecological security in river basin 并列正题名：Development of circular economy in China On the legal system of spousal separation in China Report on the development of circular economy in China Impact of eac legal system on regional economic integration Report on the devekopment of circular economy in China