Since the day before yesterday.

从前天开始的。

youdao

I should be tired since the day before yesterday my life.

前天应该是我长这么大以来最累的一天吧。

youdao

We are sending people to Qingchuan, Guangyuan, Shifang since the day before yesterday, and the donations is going with them to more victims in more areas.

前天开始，我们已经先后派遣人员前往青川，广元，什邡，物资也随着我们的志愿者和工作人员前往了更多的地区。

youdao