at-home day

The city, drab and dour by day, is transformed at night.

这座城市白天死气沉沉、单调乏味，晚上就完全变了样。

In at-home treatments, patients wear a mouth guard fitted with bleaching gel2 hours a day for two weeks, depending on the severity of staining.

而采用家庭治疗，患者只需连续两个星期每天戴上涂有漂白凝胶的护齿两个小时就可以了。具体治疗时间取决于牙齿被染色的严重程度。

an exhausting day at work

工作得筋疲力尽的一天

We try to make sure children don't feel intimidated on their first day at school.

我们努力确保孩子们在上学的第一天不胆怯。

There was usually some bread going cheap at the end of the day.

在收市前常常有些面包降价出售。

He kept us at it all day.

他让我们不停地干了一天。