Study on spatial-temporal evolution and influencing factors of tourism eco-efficiency in China 并列题名：Study on spatial-temporal evolution and influencing factors of tourism eco-efficiency in China Study on the spatio-temporal evolution and influencing factors of county economicfeences 并列题名：Study on the spatio-temporal evolution and influencing factors of county economicfeences Study of forecasting the long-time trend and influencing factors of grain price in China Study on the spatial-temporal evolution and command structure of Guangdong coastal defense in the Ming dynasty Research on spatio-temporal evolution and promotion strategy of low carbon city practice in China Analysis on carbon emission characteristics and influencing factors of thermal power industry in China Studies on the characteristics and the influencing factors of price fluctuation in China