( ( High ( thermal diffusivity ) ) ( , ( so ( ( temperature changes ) ( ( ( do not ) ( ( disturb ( mirror figure ) ) ( despite ( the ( high ( thermal ( expansion coefficient ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (JJ High) (JJ thermal) (NN diffusivity)) (, ,) (ADVP (RB so)) (NP (NN temperature) (NNS changes)) (VP (VBP do) (RB not) (VP (VB disturb) (NP (NN mirror) (NN figure)) (PP (IN despite) (NP (DT the) (JJ high) (JJ thermal) (NN expansion) (NN coefficient))))) (. .)))
High thermal diffusivity, so temperature changes do not disturb mirror figure despite the high thermal expansion coefficient.
(ROOT (S (NP (DT The) (NN term) (JJ thermal) (NN expansion)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB describe) (NP (NP (DT the) (NN change)) (PP (IN in) (NP (NN size) (CC or) (NN volume))) (PP (IN of) (NP (NP (DT a) (VBN given) (NN mass)) (PP (IN with) (NP (NN temperature))))))))))) (. .)))