( Windchill ( ( expresses ( ( ( the ( combined effect ) ) ( of ( wind ( and ( air temperature ) ) ) ) ) ( on ( body ( heat loss ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Windchill)) (VP (VBZ expresses) (NP (NP (DT the) (VBN combined) (NN effect)) (PP (IN of) (NP (NN wind) (CC and) (NN air) (NN temperature))) (PP (IN on) (NP (NN body) (NN heat) (NN loss))))) (. .)))
Windchill expresses the combined effect of wind and air temperature on body heat loss.
(ROOT (S (NP (NNP Windchill)) (VP (VBZ describes) (SBAR (WHNP (WP what)) (S (NP (DT the) (NN temperature)) (VP (VBZ feels) (PP (IN like) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN wind)) (VP (VBZ is) (VP (VBN taken) (PP (IN into) (NP (NN account)))))))))))) (. .)))