id	keyword
brj-23755	et al
brj-23755	doi
brj-23755	concentration
brj-23755	value
brj-23755	species
brj-23755	pollution
brj-23755	bark
brj-23755	direction
brj-23755	bdl
brj-23755	tree
brj-23755	article
brj-23755	wood
brj-23755	air
brj-23755	north