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