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1·February 29th is called a leap day.

2月29日被称为闰日。

2·Scientists tell couples not to marry on a leap day.

科学家告诉情侣们不要在闰日结婚。

3·The reason for a leap day or a leap year is because our calendar does not follow the Earth's orbit around the sun exactly.

闰日或闰年出现的原因是我们的历法并不精确地遵循地球围绕太阳运行的轨道。

4·Determines whether the specified day is a leap day.

确定指定的日期是否为闰日。

5·Every four years a leap day helped keep things on track.

四年一闰，闰年于二月底增加一闰日以保证万物步入正轨。

6·Determines whether the specified date in the current era is a leap day.

判断目前纪元中指定日期是否为闰日。

7·Determines whether the specified date in the current era is a leap day.

确定当前纪元中的指定日期是否为闰日。

8·When overridden in a derived class, determines whether a date is a leap day.

在衍生类别覆写时，判断某个日期是否为闰日。

9·When overridden in a derived class, determines whether the specified date in the specified era is a leap day.

当在衍生类别中覆写时，判断指定纪元中的指定日期是否为闰日。

10·They know that in a leap year, they have one more day to improve their overall results.

他们知道在闰年的时候，他们能够有“多一天”来提高他们的总产量。