(S (S (QT (DQL ``) (QTC (S (BASENP (PRP They)) (VP (ADVP (RB often)) (VP (VBP contain) (NP (BASENP (DT a) (JJ life-long) (NN work)) (PP (IN of) (BASENP (PRPD our) (NNS researchers))))))) (COMMA ,)) (DQR '')) (S (BASENP (PRP he)) (VP (VBD added)))) (PERIOD .))