Laser-cutting equipment must be totally enclosed to be safe for human operators.
( ( Laser-cutting equipment ) ( ( must ( be ( totally ( enclosed ( to ( be ( safe ( for ( human operators ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Laser-cutting) (NN equipment)) (VP (MD must) (VP (VB be) (VP (ADVP (RB totally)) (VBN enclosed) (S (VP (TO to) (VP (VB be) (ADJP (JJ safe) (PP (IN for) (NP (JJ human) (NNS operators)))))))))) (. .)))
Laser-cutting machines must be used in an open an airy area for it to work well.
( ( Laser-cutting machines ) ( ( must ( be ( ( used ( in ( ( an ( open ( an ( airy area ) ) ) ) ( for it ) ) ) ) ( to ( work well ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Laser-cutting) (NNS machines)) (VP (MD must) (VP (VB be) (VP (VBN used) (PP (IN in) (NP (NP (DT an) (JJ open) (DT an) (JJ airy) (NN area)) (PP (IN for) (NP (PRP it))))) (S (VP (TO to) (VP (VB work) (ADVP (RB well)))))))) (. .)))