It's the first of April. April Fool's Day!

今天是四月一日，是愚人节！

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On the first of April, it may be a good idea to look the other way if you see a purse lying on the sidewalk.

在四月一号这天，如果你看见路边有一个钱包，这时你一定要换种思维方式。

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The first of April is commonly known as April Fools' day, and it is customarily on this day to play a trick on a friend.

4月1日是大家都知道的“愚人节”。这一天可以拿朋友开心。

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The hard work of this grassroots effort resulted in the first Earth Day on April twenty-second, nineteen seventy.

VOA: special.2010.04.21

As soon as the Civil War broke out and Lincoln called for volunteers in late April 1861, Uriah Parmelee dropped out of his Junior year at Yale and he joined the first regiment he could get into.

内战爆发时,林肯在1861年四月末召集志愿兵,大三的乌利亚从耶鲁辍学,好不容易入了伍

耶鲁公开课 - 美国内战与重建课程节选

The first Nancy Drew books were published in April of nineteen thirty.

VOA: special.2009.08.24

The economy will expand by just 1.3% in 2010, according to the average of independent forecasts made in the first half of April and compiled by the Treasury.

ECONOMIST: The economy after the election

He slipped a note under the door of my room, instructing me to be ready by the first week of April.

NEWYORKER: Amundsen

It is imperative that companies file their petitions on April 1, or at the very least during the first week of April, because of the high demand for these visas.

CNN: Give more visas to foreign-born workers