One day, when Laozi was traveling through the Hangu Pass in Henan from the east, a purple mist suddenly appeared in the air.

一天，当老子正从东边经过河南的函谷关时，一缕紫色的薄雾突然出现在空中。

youdao

One day, when he finished delivering the letters and was ready to return, he happened to pass by a flower shop.

一天，当他送完信准备回去时，碰巧经过一家花店。

youdao

When you pass through it in one direction, it takes you exactly one day into the past; if you pass through in the other direction, it takes you exactly one day into the future.

当你从一个方向穿过它时，需要整一天回到过去，如果你从另一个方向穿过时，要花一整天去到未来。

youdao

And five weeks less one day later I decided you know what this might actually be for me and I switched from pass-fail to letter graded status at that point in time.

而第五周的最后一天,我从上及格-不及格制的课程转为上数字学分制的课程,你们可能知道这对我来说意味着什么。

哈佛公开课 - 计算机科学课程节选

Paramount's offer: Pay full price for a one-day pass and get two visits.

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It's not just the "trans-panic" murders and the constant threat of day-to-day abuse if one doesn't "pass".

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After all, it was Sunday, one of the last of the summer, and a lovely one at that - a good day not to ask people to wait in long lines to pass through security checkpoints.

NPR: Obama Previews Convention Themes On The Road