until · (used in combination with words like 到 or 至 in constructs of the form 到......为止)

Let's call it a day today.

Our task has been easy so far, but it will be difficult from now on.

Let's leave it at that.

Why don't you wait here while I finish what I'm doing?

Person of the future: "The calendar of this Unix machine that the ancients built only goes up to January 19, 2038. As such, I am convinced that this marks the day of the Earth's destruction."