( ( ( ( ( ( repairing , ) replacing ) , ) or ) ( ( installing ( heating ( , ( ventilation ( , ( or air ) ) ) ) ) ) ( ( ( conditioning systems ) , ) ( including insulation ) ) ) ) ; )
(ROOT (S (VP (VP (VBG repairing)) (, ,) (VP (VBG replacing)) (, ,) (CC or) (VP (VBG installing) (NP (NN heating) (, ,) (NN ventilation) (, ,) (CC or) (NN air)) (NP (NP (NN conditioning) (NNS systems)) (, ,) (PP (VBG including) (NP (NN insulation)))))) (: ;)))
repairing, replacing, or installing heating, ventilation, or air conditioning systems, including insulation;
(ROOT (S (NP (DT A) (JJ sealed) (, ,) (JJ vacuum-insulated) (NN reaction) (NN flask)) (VP (VBZ approximates) (NP (NP (DT the) (NN condition)) (PP (IN of) (NP (NP (DT a) (VBN isolated) (NN system)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CC neither) (NP (NN matter)) (CC nor) (NP (NN heat))) (VP (MD can) (VP (VB be) (VP (VBN exchanged) (PP (IN between) (NP (NN system) (CC and) (NNS surroundings)))))))))))) (. .)))
A sealed, vacuum-insulated reaction flask approximates the condition of a isolated system, in which neither matter nor heat can be exchanged between system and surroundings.