Cows need about two to four weeks to learn to use the robotic milking systems.

VOA: special.2009.05.12

The first three or four weeks or so we'll be following the elements of music: rhythm, melody and harmony-- and then a test.

开始的三或四周,我们会逐个介绍,音乐中的元素,节奏,旋律,和声,然后有一个考试

耶鲁公开课 - 聆听音乐课程节选

and then they will move over and do four weeks somewhere else.

然后他们会搬走，在其他地方做四周。

英国的影视产业 - SpeakingMax英语口语达人

Planting beans every two to four weeks until early August will provide a continuous harvest.

VOA: special.2009.03.24

And so what we ended up doing is the last four weeks of class after we had grounded it in the history of the modern university, understood the structure of it, we had the students select topics that they were really interested in.

所以我们最后选择,在最后四周，在我们了解了,现代大学的历史，理解大学的结构之后，我们让学生们选择一些,他们真正感兴趣的话题。

普林斯顿公开课 - 人性课程节选

By the thirty-fourth week, it could remember the sound for four weeks.

VOA: special.2010.11.30

I've assigned a full two weeks to the Republic, which would be four lectures, but because I wanted to do some other things with the course as well, I had to cut the Republic by one lecture, and now I'm paying for that today.

我会分配两周的时间来消化《理想国》,等同四堂讲课，但因为我想要,加一些内容到课堂来，所以我必需砍掉《理想国》的一堂课，今天我要付出代价。

耶鲁公开课 - 政治哲学导论课程节选

While the adults go out at night for food, the young bats hang out in the cave for four or five weeks.

VOA: special.2009.12.07

Later,she takes the soap out of the mold and places it in a storage area to cure or dry for four to six weeks.

VOA: special.2011.03.09

"Those are the babies who are born between thirty-four and thirty-seven weeks gestation.

VOA: special.2009.10.26

Two weeks later, four more would-be bombers tried, but failed to attack underground trains.

VOA: standard.2010.04.01

Those tests,we anticipate, will take approximately four to six additional weeks."

VOA: standard.2009.06.26

You got four full weeks of vacation - twice the usual paid time away - and editors got a week of company-paid educational travel to anyplace they wanted to go in the country.

VOA: standard.2010.03.08

Analyst Ali Nourizadeh, of the London-based Center for Arab and Iranian Studies, says the Iranian government is doing its best to prevent students from protesting, but he thinks student determination to go ahead with Monday's rallies is stronger: "The regime has already started four,five weeks ago arresting students.

VOA: standard.2009.12.07

General Myers spent four years as the top U.S.military officer, starting just weeks after the September 11 attacks in 2001, through the early successes in Afghanistan and Iraq and the beginning of the Iraqi insurgency, and ending in late 2005, just before the major outbreak of violence in Iraq and well before the resurgence of the Taliban in Afghanistan during the last two years.

VOA: standard.2009.10.16