( ( ( The ( various areas ) ) ( of concentration ) ) ( ( are ( described below ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ various) (NNS areas)) (PP (IN of) (NP (NN concentration)))) (VP (VBP are) (VP (VBN described) (ADVP (RB below)))) (. .)))
The various areas of concentration are described below.
(ROOT (S (NP (DT The) (NN term) (NN concentration)) (VP (VBZ describes) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS items)) (PP (IN in) (NP (NP (DT a) (VBN given) (NN area)) (CC or) (NP (NN volume)))))))) (. .)))