a blue day.

• 乏味的一天

a blue day.的用法和样例：

例句

1. He found her uninteresting as a person.
   他发现她是个很乏味的人。
2. I always considered Sunday the dullest day of the week.
   我一直认为礼拜天是一周当中最枯燥乏味的一天。