su·per·erog·a·to·ry /ˌsupərɪˈrɑgəˌtori, ˌtɔr-/
(a.)額外的
Su·per·e·rog·a·to·ry a. Performed to an extent not enjoined, or not required, by duty or necessity; as, supererogatory services.
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supererogatory
adj : more than is needed, desired, or required; "trying to lose
excess weight"; "found some extra change lying on the
dresser"; "yet another book on heraldry might be
thought redundant"; "skills made redundant by
technological advance"; "sleeping in the spare room";
"supernumerary ornamentation"; "it was supererogatory
of her to gloat"; "delete superfluous (or unnecessary)
words"; "extra ribs as well as other supernumerary
internal parts"; "surplus cheese distributed to the
needy" [syn: excess, extra, redundant, spare, superfluous,
supernumerary, surplus]