( ( ( covalent bond ) ( ( A bond ) ( ( in which ) ( ( an ( electron pair ) ) ( ( is equally ) ( shared ( by ( protons ( in ( two ( adjacent atoms ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (ADJP (JJ covalent)) (NN bond)) (NP (NP (DT A) (NN bond)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT an) (NN electron) (NN pair)) (VP (VBZ is) (ADVP (RB equally)) (VP (VBN shared) (PP (IN by) (NP (NP (NNS protons)) (PP (IN in) (NP (CD two) (JJ adjacent) (NNS atoms)))))))))) (. .)))
covalent bond A bond in which an electron pair is equally shared by protons in two adjacent atoms.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS electrons)) (VP (VBP are) (VP (VBN shared) (ADVP (RB equally)))))) (, ,) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (NN nonpolar) (NNS bonds)))) (. .)))