这是繁忙的一天，我累坏了。

It's been a heavy day and I'm tired.

《柯林斯英汉双解大词典》

这是我本周最繁忙的一天。

This is the busiest day of the week.

youdao

我一定会再到贵店光顾，而最主要的原因就是，即使在业务繁忙的一天，我仍能得到高质量的服务和关怀。

I will definitely be shopping at your store again, primarily because of the high-quality service and attention I received there on a very busy day.

youdao