( ( High-energy neutrons ) ( ( ( ( are ( very penetrating ) ) and ) ( can ( ( travel ( ( great distances ) ( in ( ( ( ( air ( -LRB- ( ( ( ( ( hundreds or ) even ) thousands ) ( of meters ) ) -RRB- ) ) ) and ) ( moderate distances ) ) ( -LRB- ( ( several meters ) -RRB- ) ) ) ) ) ) ( in ( common solids ) ) ) ) ) . ) )
(ROOT (S (NP (JJ High-energy) (NNS neutrons)) (VP (VP (VBP are) (ADJP (RB very) (JJ penetrating))) (CC and) (VP (MD can) (VP (VB travel) (NP (NP (JJ great) (NNS distances)) (PP (IN in) (NP (NP (NN air)) (PRN (-LRB- -LRB-) (NP (NP (UCP (NP (NNS hundreds)) (CC or) (ADVP (RB even))) (NNS thousands)) (PP (IN of) (NP (NNS meters)))) (-RRB- -RRB-)) (CC and) (NP (JJ moderate) (NNS distances)) (PRN (-LRB- -LRB-) (NP (JJ several) (NNS meters)) (-RRB- -RRB-))))) (PP (IN in) (NP (JJ common) (NNS solids)))))) (. .)))
High-energy neutrons are very penetrating and can travel great distances in air (hundreds or even thousands of meters) and moderate distances (several meters) in common solids.
(ROOT (S (NP (JJ Meter) (JJ much) (NN distance)) (VP (MD can) (VP (VB beta) (NP (JJ particles) (NN travel)) (PP (IN through) (NP (NN air))))) (. .)))