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The new development pattern of "dual circulation" raises interesting questions regarding new pathways of coordinated development between the tourism industry and urbanization. The Guangdong-Hong Kong-Macao Greater Bay Area (Greater Bay Area) is a connecting area of internal and external circulation of China’s economy, and accordingly, this paper selects the “9 + 2” urban agglomeration of the Greater Bay Area as the study area. Given the differences in statistical indexes and units among Guangdong, Hong Kong and Macao, this paper selects suitable indexes to establish an evaluation system for development of the tourism industry and new-type urbanization. The paper then calculates the comprehensive development level and coupling coordination degree of the tourism industry and new-type urbanization in the 11 cities of the Greater Bay Area from 2010 to 2019 using the entropy method and coupling coordination degree model. The results show that the comprehensive development levels of and coupling coordination degree between the tourism industry and new-type urbanization in the 11 cities exhibit evident grading. Ranking the high-quality development level from high to low, the 11 cities can be divided into three echelons: Guangzhou is the first echelon, Shenzhen and Hong Kong are the second echelon, and the other cities are the third echelon. All 11 cities exhibited a steady development trend in the period. Accordingly, this paper further puts forward countermeasures and suggestions to cope with the "dual circulation" strategy and continuously enhance the benign interaction between the development of the tourism industry and the process of urbanization.

The ecological security of Iodic agent was firstly studied in the domestic. To investigate environmental toxicology of the new developed of Cydiodine Powder(CDP), we research toxicity of CDP to zebrafish and earthworm, and the skin and eye irritation studies to rabbit. The static method, with reference to the chemical pesticide environmental safety evaluation test guidelines (GB/T 31270.12 2014), was used to research the toxicity to zebrafish. The toxicity to earthworm was studied with reference to the chemical pesticide environmental safety evaluation test guidelines (GB/T 31270.15 2014). The skin and eye irritation was tested reference to "disinfection technical specifications (2002 edition). The results appear to be 5.775 mg of A.I. / L of 96 h LC50 value of CDP to zebrafish. The earthworm deaths is 0 with 100 mg of A.I. / kg dry soil treatment after 14 day, and LC50 > 100 mg/kg dry soil. Skin irritation and eye irritation reaction maximum score was 0.33 and 2.75. This result Suggested that CDP was without excitant for skin and eye. The results of this study indicated that CDP is an environment friendly new disinfectant, and will not produce environmental toxicity.

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