id	keyword
ajst-19173	ecological
ajst-19173	land
ajst-19173	security
ajst-19173	haikou
ajst-19173	city
ajst-19173	evaluation
ajst-19173	use
ajst-19173	index
ajst-19173	haikou city
ajst-19173	area
ajst-19173	study
ajst-19173	indicator