Study on the theory of well-cycling and it's regulation and control mechanism 并列题名：Photo of water color of aquaculture and its regulation and control 并列题名：Study on the duality of fear in school and its alleviating mechanism 并列题名：Study on the structure of financial regulation and supervision Photo of water color of aquaculture and its regulation and control 并列题名：Study on the theory of western children's rights and its contemporary value