( ( Some ( of ( the ( concentration areas ) ) ) ) ( ( are ( described below ) ) . ) )
(ROOT (S (NP (NP (DT Some)) (PP (IN of) (NP (DT the) (NN concentration) (NNS areas)))) (VP (VBP are) (VP (VBN described) (ADVP (RB below)))) (. .)))
Some of the concentration areas 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)))))))) (. .)))