covariant index共变: co-variation指标: target; quota; norm; index; ...共变指数: covariant index反变指标: contravariant index逆变指标: contravariant index下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:共变指标，即可在微信中查询翻译
