Before this week's surge of 4,000 Marines and hundreds of Afghan forces into Afghanistan's southern Helmand province, the issue of how such a bold move would impact Pakistan was already on the minds of top U.S.policy makers.

VOA: standard.2009.07.04

We'll talk about cell culture engineering during Week 4, how do you maintain cells in culture, what are the limits of this.

第四周我们会探讨细胞培养工程,人们如何在培养基中维持细胞的存活,这种方法的局限性是什么

耶鲁公开课 - 生物医学工程探索课程节选

Yeah, so, kids usually go to parties at least, you know, usually around 3 or 4 days a week.

好，所以，孩子们通常至少每周有三四天都去派对。

派对很好玩 - SpeakingMax英语口语达人

Alright, welcome back to CS50, this is the start of week 4.

欢迎来到CS50学堂，这是第四周的课程。

哈佛公开课 - 计算机科学课程节选

In a help session what he might do typically is solve between four and eight problems that illustrate the key principle being talked that week.

在帮助课程中他一般会,解决4到8个问题,来阐明那一周教的关键原理。

麻省理工公开课 - 媒体、教育、市场课程节选

you know, just for a little exercise, because I'm sitting in a cab 4 or 5 days a week.

做点运动，因为我一周四、五天都是在驾驶室里坐着。

愉快的音乐庆典 - SpeakingMax英语口语达人

and I think it's up to like 3 or 4 days a week now.

我觉得它现在每周开放多达三四天吧。

联合广场呢 - SpeakingMax英语口语达人

You can search obviously by any of the fields up top by days ; of the week you want a class; days of the week you don't want a class; grad level or undergrad level, faculty scores that are 4.0 and higher, ; course overall scores that are 4.0 and higher; and a whole number of other features including synchronization with Google calendar.

你可以按日期来搜索网页上的任一科目,以决定哪天去上课，哪天不去上课;,研究生课程或本科生课程,教师打分为4分或更高的课程，课程总学分为4分或者更高的课程;,当然很多其他选择方式,包括Google同步日历。

哈佛公开课 - 计算机科学课程节选