Forty-five years to the day after Martin Luther King spoke of his dream, America will take a giant leap towards the realisation of that great call for justice.

距马丁·路德·金讲出他的梦想已经有四十五年过去了，美国将朝着对于公正的伟大呼唤的实现迈出重要的一步。

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Indeed, the day of the week for a given date progresses by one annually, except on leap years, where it progresses by two.

确实，对于一个给定的日期，每年属于哪个星期几总是后移一天，闰年除外，后移两天。

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By the time of Augustus, the so-called Alexandrian calendar had even incorporated an additional day for leap years.

到奥古斯都时期，“亚历山大历”甚至在闰年包含额外的一天。

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While most years are 52 weeks long plus one day, leap years have 52 weeks and two extra days.

WSJ: For Some, All in a Leap Day's Work

His mother Mary Ann, 79 years old, a leap-day baby who will celebrate her 20th birthday next Wednesday, suggested the idea in 1988.

WSJ: For Some, All in a Leap Day's Work

Airlines have posted an average 6.3% increase in the number of February passengers during leap year because of the extra day, based on the past eight years' data from the federal Bureau of Transportation Statistics.

WSJ: For Some, All in a Leap Day's Work