Over six hundred people were wounded in a single day.

一天内六百多人受伤。

《柯林斯英汉双解大词典》

With a determined effort, they finished the three-day task in a single day.

他们一发狠，三天的任务一天就完成了。

《新英汉大辞典》

Any gift, says the policy, must be consumable in a single day.

政策规定，任何礼物只能是可单日消费的。

youdao

The value of stock for the Montgomery Ward store dropped from eighty-three dollars to fifty in a single day.

VOA: special.2011.02.17

In essence, this collapse in stock prices -the one-day collapse in stock prices -I think in the U.S. The price was, depending on which index you were looking at, were down 21-22% in a single day.

实际上,这次股价暴跌,股价一天内的跌幅,当然在美国国内,要看你参考的是哪种股指,但基本上一天之内暴跌21-22%

耶鲁公开课 - 金融市场课程节选

The experts also said people should take less than four thousand milligrams of acetaminophen in a single day.

VOA: special.2009.07.08

When the dust settled , the Dow was down 22% in a single day.

FORBES: Fears That Sparked Black Monday In 1987 Dormant But Not Dead

The result was that its stock fell about 70 percent in a single day.

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Holbrooke's frantic pre-Dayton shuttle often took him to three countries in a single day.

CNN: Giving Peace a Chance