CCTV9英语新闻：马丁·路德金“我有一个梦想”演讲50周年

Wednesday marked the 50th anniversary¹ of Martin Luther King’s "I Have a Dream" speech. On the occassion, US president Barack Obama addressed the gathered crowd from the steps of the Lincoln Memorial where Dr. King delivered his speech.
 周三是马丁·路德·金“我有一个梦想”演讲50周年纪念日。这一天，美国总统奥巴马在当年马丁·路德·金发表演讲的林肯纪念堂外的台阶上发表演讲。

1 anniversary   

n.周年(纪念日)

参考例句：

• They celebrate their wedding anniversary annually.他们每年庆祝一番结婚纪念日。
• Today is my parents'30th wedding anniversary.今天是我父母结婚30周年纪念日。