id	keyword
brj-24702	toy
brj-24702	paulownia
brj-24702	wood
brj-24702	toys
brj-24702	preferences
brj-24702	et al
brj-24702	beech
brj-24702	ash
brj-24702	characteristics
brj-24702	article
brj-24702	children
brj-24702	environmental
brj-24702	shen
brj-24702	bioresources
brj-24702	20(4
brj-24702	value
brj-24702	china
brj-24702	study
brj-24702	peer
brj-24702	research
brj-24702	surface
brj-24702	doi
brj-24702	toy preferences