世界后悔日的英文：
Ctrl Z Day（网络节日之一，每年7月的第二个星期五））

参考例句：

It is said that Ctrl Z Day is popular in North America in recent years.
据说世界后悔日最近几年在北美比较流行。

ctrl是什么意思：
计算机的Ctrl按键

It is said that Ctrl Z Day is popular in North America in recent years.
据说世界后悔日最近几年在北美比较流行。

day是什么意思：
n. 一天；白昼，白天；工作日；时代，时期

Things go on day by day.
事情逐日进行着。

Day by day the situation is improving.
情况在一天天地好转。

Like this, day after day.
就这样，日复一日。

It was a fateful day.
那是个不祥的日子。

Meantime, from day to day they endure.
同时，一天天他们捱了下去。