Doctors are advised to give them within the hour before the operation.

VOA: special.2010.04.21

And that operation is being performed before others.

并且那个操作是在其它操作之前的。

哈佛公开课 - 计算机科学课程节选

Then,just before the congressional debate, he learned he would need an operation.

VOA: special.2010.06.17

Since the Israeli assault, rocket attacks from Gaza have continued, but in fewer numbers than before the operation.

VOA: standard.2009.09.09

As of Monday,there were about But local media reports many of them left before the police operation.

VOA: standard.2009.09.22

UNHCR spokesman,Andrej Mahecic,says more than 14,000 Mauritanian refugees, comprising 3,634 families, had returned from Senegal to four regions in Mauritania before the operation was suspended.

VOA: standard.2009.10.24

So the whole security operation revolved around this point to eliminate this terrorist before he could blow his jacket and the security forces were very successful in eliminating this terrorist before he could blow up his jacket."

VOA: standard.2009.10.11