( ( The ( ( ( ( stronger ( the ( gravitational potential ) ) ) ( -LRB- ( ( ( the closer ) ( ( the clock ) ( is ( to ( ( the source ) ( of gravitation ) ) ) ) ) ) -RRB- ) ) ) , ) ( the ( slower time ) ) ) ) ( passes . ) )
(ROOT (S (NP (DT The) (NP (NP (NP (JJR stronger)) (NP (DT the) (JJ gravitational) (NN potential))) (PRN (-LRB- -LRB-) (SBAR (X (DT the) (RBR closer)) (S (NP (DT the) (NN clock)) (VP (VBZ is) (PP (TO to) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (NN gravitation)))))))) (-RRB- -RRB-))) (, ,) (NP (DT the) (JJR slower) (NN time))) (VP (VBZ passes)) (. .)))
The stronger the gravitational potential (the closer the clock is to the source of gravitation), the slower time passes.
(ROOT (S (NP (JJ Strong) (JJ gravitational) (NNS fields)) (VP (VBP are) (ADJP (JJ capable) (PP (IN of) (S (VP (VBG altering) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NN time) (NN passing))))))))) (. .)))