( ( HEATING ( MAY ( RELEASE ( HYDROGEN ( SULFIDE GAS ) ) ) ) ) ( ( -LRB- ( ( ( H 2 ) S ) -RRB- ) ) ( ( This material ) ( ( is ( stable ( in ( ( closed containers ) ( at ( ( room temperature ) ( under ( normal ( storage ( and ( handling conditions ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (NP (NNP HEATING) (NNP MAY) (NNP RELEASE) (NNP HYDROGEN) (NNP SULFIDE) (NNP GAS)) (PRN (-LRB- -LRB-) (NP (NP (NNP H) (CD 2)) (NP (NNP S))) (-RRB- -RRB-)) (NP (DT This) (NN material)) (VP (VBZ is) (ADJP (JJ stable) (PP (IN in) (NP (NP (VBN closed) (NNS containers)) (PP (IN at) (NP (NP (NN room) (NN temperature)) (PP (IN under) (NP (JJ normal) (NN storage) (CC and) (NN handling) (NNS conditions))))))))) (. .)))
HEATING MAY RELEASE HYDROGEN SULFIDE GAS (H 2 S) This material is stable in closed containers at room temperature under normal storage and handling conditions.
(ROOT (S (NP (NNP Hydrogen)) (VP (VBZ is) (PP (IN in) (NP (NP (NN gas) (NN form)) (PP (IN at) (NP (NN room) (NN temperature)))))) (. .)))