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1·Leap years were believed to be difficult, and leap days were unlucky.

闰年是生活困苦的象征，而闰日则是不幸的代表。

2·Why do we have leap years?

为什么有闰年？

3·The extra three days were for leap years.

多出来的三天是因为闰年。

4·Only in leap years date corrections may be required.

只有在闰年日期可能需要修正。

5·But century years divisible by 400, like 2000, would be leap years.

但能被400整除的世纪年2000年，则为闰年。

6·However, Gregorian years that are divisible by 400 are leap years.

但是，被 400 整除的公历年份是闰年。

7·Don't forget about the adjustment for leap years when using this trick.

使用这一技巧时不要忘记对闰年做出调整。

8·They celebrate their birthdays on February 28th or March 1st during non-leap years.

非闰年时，他们会在二月二十八日或三月一日庆生。

9·Years that are divisible by 100 are not leap years, unless they're also divisible by 400.

发现可被100整除的年份不一定是闰年，除非它能被400整除。

10·23 years. That's 8, 395 days (not counting leap years) : 201, 480 hours: 12, 088, 800 minutes.

23年，一共8395天(不算闰年)：201480小时：12088800分钟。