After two days at sea, it was good to be back on terra firma again.

在海上度过两天之后，又回到使人觉得坚实的陆地，真是惬意。

《牛津词典》

In a good month, a stuntman can film up to 20 days, traveling around China to be on location.

一个月时间里，一个特技演员可以在中国各地拍摄长达20天的影片。

youdao

In those days it was not thought entirely proper for a woman to be on the stage.

在那时，女人登台演出不被认为是完全适宜的。

《柯林斯英汉双解大词典》

He said he has ordered a report in thirty days on what,if any, additional safety measures and technologies should be required to prevent future spills.

VOA: special.2010.05.01

And, you've undoubtedly heard a lot in the public press, and even in the political dialogue such as it is these days that hydrogen might be on environmentally friendly fuel.

毫无疑问你已经在公开新闻上，甚至在政治的对话上听到过了,比如最近这些天,氢气是一种环境友好的燃料。

麻省理工公开课 - 固态化学导论课程节选

There are some passages in which the flood is said to have lasted for 40 days, or be on the earth for 40 days.

有些片段描述，比如说在《创世纪》第7章第17节中,雨要下40天。

耶鲁公开课 - 旧约导论课程节选

She asked for telecommuting options to have uninterrupted editing time, and to be productive on days when one of her three children were sick and got it.

FORBES: Connect

Alliance leader Naomi Long said her party's councillors had behaved responsibly in Belfast in taking advice on equality and voting that the union flag should be flown on designated days.

BBC: Northern Ireland Assembly session over flag disturbances

Over 100 staff will be needed on race days and Mr Walters said the benefits to the wider community would be great.

BBC: Racecourse under starter's orders