大月的英文：
a 31-day month

day是什么意思：
n. 一天；白昼，白天；工作日；时代，时期

Things go on day by day.
事情逐日进行着。

Day by day the situation is improving.
情况在一天天地好转。

Like this, day after day.
就这样，日复一日。

It was a fateful day.
那是个不祥的日子。

Meantime, from day to day they endure.
同时，一天天他们捱了下去。

month是什么意思：
n. 月，月份；一个月的时间

month of Sundays
很长的时间

It was a scene which was enacted month after month for these years.
这些年里，那一情况每个月都会发生。

Their dictionary was printed last month.
他们的字典已于上个月出版发行。

The Democratic primary was held this month.
民主党候选人初选于本月举行。

all the months fly by.
十二个月匆匆飞逝。