id	keyword
ajst-13418	tunnel
ajst-13418	detection
ajst-13418	lining
ajst-13418	cracks
ajst-13418	technology
ajst-13418	disease
ajst-13418	system
ajst-13418	laser
ajst-13418	china
ajst-13418	equipment
ajst-13418	deformation
ajst-13418	surface