contravariant index逆变: contravariant指标: target; quota; norm; index; ...反变指标: contravariant index共变指标: covariant index协变指标: covariant 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:逆变指标，即可在微信中查询翻译
