( ( ( ( ( ( The unit ) ( of pressure ) ) , ) torr ) , ) ( ( is ( ( the same ) ( as ( ( a millimeter ) ( of pressure ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (NN unit)) (PP (IN of) (NP (NN pressure)))) (, ,) (NP (NN torr)) (, ,)) (VP (VBZ is) (NP (NP (DT the) (JJ same)) (PP (IN as) (NP (NP (DT a) (NN millimeter)) (PP (IN of) (NP (NN pressure))))))) (. .)))
The unit of pressure, torr, is the same as a millimeter of pressure.
(ROOT (S (NP (DT A) (NN torr)) (VP (VBZ is) (NP (NP (DT a) (NN unit)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN pressure)))))))) (. .)))
A torr is a unit used to measure pressure.