a. 附属的, 增加的

[ adj ]
nonessential but helpful
<adj.all>
accessorial services included sorting and packing

Accessorial \Ac`ces*so"ri*al\, a.
Of or pertaining to an accessory; as, accessorial agency,
accessorial guilt.

added \added\ adj.
1. being in addition [to something else] [Narrower terms:
{accessorial ] additional, further(prenominal),
more(prenominal) --- (used with mass nouns: "takes on
added significance"; "asked for additional help"; "we have
further information"; "there will be further delays";
"kids have more fun than anybody") [Narrower terms:
{another(prenominal), other(prenominal),
else(postnominal), extra, intercalary}] [Narrower terms:
{superimposed ] [Narrower terms: {supplementary,
supplemental ] [Narrower terms: {value-added ]
{subtracted}
[WordNet 1.5]