( ( ( Middle ( Atmosphere ( ( -LRB- ( Stratosphere -RRB- ) ) Dynamics ) ) ) 3 ) . )
(ROOT (NP (NP (NNP Middle) (NNP Atmosphere) (PRN (-LRB- -LRB-) (NP (NNP Stratosphere)) (-RRB- -RRB-)) (NNP Dynamics)) (ADJP (CD 3)) (. .)))
Middle Atmosphere (Stratosphere) Dynamics 3.
(ROOT (S (NP (DT The) (NN stratosphere)) (VP (VBZ is) (NP (DT the) (NN heat) (NN source))) (. .)))