Before last week's announcement, the total number of so-called exoplanets outside our solar system was just over five hundred.

VOA: special.2011.02.09

So I think that's enough, you can follow along with the syllabus and see sort of what the topics are each week, what the reading assignment is to do before the lecture in order to get the most out of the lecture.

我觉得说的差不多了,你们可以根据课程大纲,来看每周会将什么内容,在每次课之前看看阅读任务是什么,这样才能在课上有更多收获

耶鲁公开课 - 生物医学工程探索课程节选

They announced their new album only a week before it went on sale to avoid the usual publicity created by critics.

VOA: special.2009.02.06

This week America's top military officer expressed support for the proposal at a hearing before the Senate Armed Services Committee.

VOA: special.2010.02.06

Guests were not told where the wedding was to be held until a week before the event.

VOA: special.2010.08.09

This week,President Barack Obama went before Congress and the nation to better explain his health care proposals.

VOA: special.2009.09.12

A miscarriage is the natural loss of a pregnancy before the twentieth week.

VOA: special.2010.08.11

But I think it really is a call to make sure you remember to do that during the day,during the week, during the months before and after Valentine's Day."

VOA: special.2010.02.08

White House press secretary Robert Gibbs says the president will not announce his Afghanistan strategy before returning from Asia next week.

VOA: standard.2009.11.13

The recount,ordered by the Election Complaints Commission, began this week and comes before the full,election results have been announced.

VOA: standard.2009.09.15

It will be on the agenda again when he visits Pakistan later in the week, before heading into the war zone itself.

VOA: standard.2010.07.22

A week before announcing major spending cuts, British Finance Minister George Osborne said the debt problems in Greece serve as a warning.

VOA: standard.2010.05.17

But the ACLU's statement, like the congressional vote, occurred before last week's potential catastrophe on a U.S.-bound jet.

VOA: standard.2009.12.30

It is the site of what used to be his son's home before Israeli forces came here early one morning this week and demolished it.

VOA: standard.2009.04.09

The talks taking place this week in Barcelona will be the last before a major U.N.summit in December where delegates will hash out a new deal to replace the Kyoto Protocol.

VOA: standard.2009.11.04

The information was leaked to the media early last week, shortly before Semenya was due to run in the final of the women's which she won in the fastest time of the year.

VOA: standard.2009.08.25

President Barack Obama, a White Sox fan, who chatted with the pitcher in the clubhouse of the All Star game last week before throwing out the first pitch, is left handed like Buehrle.

VOA: standard.2009.07.24

U.S.officials hope it can be convened before key big-power discussions of the Iranian nuclear issue begin in New York during the third week of this month, on the sidelines of the U.N.General Assembly session.

VOA: standard.2009.09.11

She holds similar political talks later in the week with Thai officials in Bangkok before flying to the resort island of Phuket to join in an annual dialogue of Pacific-rim country foreign ministers with those of ASEAN, the Association of Southeast Asian Nations.

VOA: standard.2009.07.15

After returning from a trip to Afghanistan, Senator Daniel Inouye, who heads the powerful Senate Appropriations Committee, issued a statement this week appearing to support the request by General McChrystal for more troops, although Inouye said more discussion would be needed before any final decision on troop levels is made.

VOA: standard.2009.10.15