While economists designing plans may worry about ex ante welfare costs, public or private plan administrators may also worry about ex post regret - the after-the-fact costs of a decision.是什么意思_While economists designing plans may worry about ex ante welfare costs, public or private plan administrators may also worry about ex post regret - the after-the-fact costs of a decision.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句