( ( ( ( Expansion : ) ( ( ( ( An increase ) ( in size ) ) , ) ( for example ) ) ) : ) ( ( when ( ( a ( metal rod ) ) ( is heated ) ) ) ( , ( it ( ( increases ( ( ( in length ) and ) ( perhaps ( also ( in diameter ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (NN Expansion)) (: :) (NP (NP (DT An) (NN increase)) (PP (IN in) (NP (NN size))) (, ,) (PP (IN for) (NP (NN example)))) (: :)) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN metal) (NN rod)) (VP (VBZ is) (ADJP (JJ heated))))) (, ,) (NP (PRP it)) (VP (VBZ increases) (PP (PP (IN in) (NP (NN length))) (CC and) (PP (ADVP (RB perhaps)) (ADVP (RB also)) (IN in) (NP (NN diameter))))) (. .)))
Expansion : An increase in size, for example: when a metal rod is heated, it increases in length and perhaps also in diameter.
(ROOT (S (NP (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN increase)) (PP (IN in) (NP (NN length)))) (VP (VBZ happens) (PP (TO to) (NP (NN metal) (NN railroad) (NNS tracks))) (PP (IN during) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (DT a) (NN summer) (NN day)))))) (. .)))