id	keyword
esrj-37601	water
esrj-37601	groundwater
esrj-37601	mining
esrj-37601	district
esrj-37601	coal
esrj-37601	factor
esrj-37601	analysis
esrj-37601	karst
esrj-37601	group
esrj-37601	samples
esrj-37601	china
esrj-37601	multivariate