id	keyword
brj-22231	energy
brj-22231	development
brj-22231	biomass
brj-22231	biomass energy
brj-22231	utilization
brj-22231	henan
brj-22231	cec
brj-22231	province
brj-22231	china
brj-22231	technology
brj-22231	resources
brj-22231	civilization
brj-22231	et al
brj-22231	doi
brj-22231	henan province
brj-22231	carbon
brj-22231	fig