( ( ( The ( time interval ) ) ( for ( ( the passage ) ( of ( one wavelength ) ) ) ) ) ( ( is ( called ( ( the period ) ( -LRB- ( T -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN time) (NN interval)) (PP (IN for) (NP (NP (DT the) (NN passage)) (PP (IN of) (NP (CD one) (NN wavelength)))))) (VP (VBZ is) (VP (VBN called) (NP (NP (DT the) (NN period)) (PRN (-LRB- -LRB-) (NP (NNP T)) (-RRB- -RRB-))))) (. .)))
The time interval for the passage of one wavelength is called the period (T).
(ROOT (S (NP (NN Period)) (VP (VBZ is) (NP (NP (DT the) (NN time) (NN interval)) (VP (VBN required) (PP (IN for) (NP (CD one) (JJ complete) (NN wave) (S (VP (TO to) (VP (VB pass) (NP (NP (DT a) (NN point)) (VP (VBN called))))))))))) (. .)))