同义词： spear carrier extra
"supernumerary ornamentation"; "extra ribs as well as other supernumerary internal parts"
同义词： excess extra redundant spare supererogatory superfluous surplus
以上来源于: WordNet
ADJ exceeding a regular or proper number; extra 额外的
N a person or thing that exceeds the normal, required, or regular number 定额以外的人
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