Any higher standard of care that the researchers or sponsors are able to provide is supererogatory : that is morally praiseworthy but not obligatory .
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It was supererogatory for her to gloat ( Mary McCarthy )
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美[ˌsu:pərə'rɒgəˌtoʊrɪ]英[ˌsu:pərə'rɒgətərɪ]
adj.额外的，超出职务的