equal opportunity 为什么不是equivalent opportunity?

opportunity Equal Opportunity,Our National Myth这篇文章有中文版吗? opportunity是什么意思 为什么是a unique opportunity 而不是an 英语翻译原文：Time is an equal opportunity employer.Each human has “a unique opportunity”为什么冠词用a不用an? chance choice opportunity 区别 英语翻译continent和opportunity Opportunity seldom knocks twice. take this opportunity是什么意思 关于经济学opportunity cost opportunity cost 含义是什么?