( ( In ( order ( for ( an ( object ( to ( have ( a smell ) ) ) ) ) ) ) ) ( it ( ( must ( ( release molecules ) ( into ( the air ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (NP (NN order)) (PP (IN for) (NP (DT an) (NN object) (S (VP (TO to) (VP (VB have) (NP (DT a) (NN smell))))))))) (NP (PRP it)) (VP (MD must) (VP (VB release) (NP (NNS molecules)) (PP (IN into) (NP (DT the) (NN air))))) (. .)))
In order for an object to have a smell it must release molecules into the air.
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN substance)) (VP (VBZ does) (RB not) (VP (VB release) (NP (NNS molecules)) (PP (IN into) (NP (NP (DT the) (NN air)) (PP (IN from) (NP (PRP$ its) (NN surface))))))))) (, ,) (NP (PRP it)) (VP (MD will) (RB not) (VP (VB have) (NP (DT a) (NN smell)))) (. .)))
If a substance does not release molecules into the air from its surface, it will not have a smell.