( Beryllium ( ( is ( ( a ( lightweight metal ) ) ( that ( is ( used ( ( ( ( ( ( for ( nuclear weapons ) ) , ) ( for ( atomic energy ) ) ) , ) and ) ( for ( ( metal alloys ) ( such ( as ( ( ( ( beryllium - ) ( ( copper and ) beryllium ) ) - ) aluminum ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Beryllium)) (VP (VBZ is) (NP (NP (DT a) (JJ lightweight) (NN metal)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN used) (PP (PP (IN for) (NP (JJ nuclear) (NNS weapons))) (, ,) (PP (IN for) (NP (JJ atomic) (NN energy))) (, ,) (CC and) (PP (IN for) (NP (NP (NN metal) (NNS alloys)) (PP (JJ such) (IN as) (NP (NP (NN beryllium)) (: -) (NP (NN copper) (CC and) (NN beryllium)) (: -) (NP (NN aluminum))))))))))))) (. .)))
Beryllium is a lightweight metal that is used for nuclear weapons, for atomic energy, and for metal alloys such as beryllium- copper and beryllium- aluminum.
(ROOT (S (NP (NP (DT The) (JJ low) (JJ atomic) (NN number)) (PP (IN of) (NP (NN beryllium)))) (VP (VBZ allows) (S (NP (PRP it)) (VP (TO to) (VP (VB absorb) (NP (NNPS x-rays)))))) (. .)))