id	keyword
hom-98	china
hom-98	zhu
hom-98	climate
hom-98	kezhen
hom-98	chinese
hom-98	regionalization
hom-98	zhu kezhen
hom-98	scientific
hom-98	classification
hom-98	science
hom-98	köppen
hom-98	regions
hom-98	meteorology
hom-98	history
hom-98	national
hom-98	zhongguo
hom-98	soviet
hom-98	research