( ( This tilt ) ( ( is ( called ( ( ( an ( airfoil 's ) ) angle ) ( of attack ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN tilt)) (VP (VBZ is) (VP (VBN called) (NP (NP (NP (DT an) (NN airfoil) (POS 's)) (NN angle)) (PP (IN of) (NP (NN attack)))))) (. .)))
This tilt is called an airfoil's angle of attack.
(ROOT (S (NP (NP (NNP Instruments)) (SBAR (WHNP (WDT that)) (S (VP (VB measure) (NP (NP (DT the) (NN angle)) (PP (IN of) (NP (NP (DT the) (NN slope)) (PP (IN of) (NP (DT a) (NN volcano)))))))))) (VP (VBP are) (VP (VBN called) (NP (NN tilt) (NNS meters)))) (. .)))