id	keyword
ajst-31829	density
ajst-31829	district
ajst-31829	urban
ajst-31829	distribution
ajst-31829	service
ajst-31829	kernel
ajst-31829	xining
ajst-31829	areas
ajst-31829	data
ajst-31829	agglomeration
ajst-31829	facilities
ajst-31829	core