And it sank,too. The Confederacy also developed very effective underwater explosive devices for use in the harbors.

VOA: special.2009.09.10

So, it was effective, it was rapidly then introduced into general use.

因此,疫苗是有效的,它迅速得到了广泛应用

耶鲁公开课 - 生物医学工程探索课程节选

Based on the results, researchers advised doctors and parents to warn young women about the risk of wrinkles as a more effective way to prevent tanning bed use.

VOA: special.2010.07.06

"This is an evaluation instrument that is finally able to capture who is highly effective and who is ineffective and who could be doing better and could use some assistance.

VOA: special.2011.08.11

French says that, in addition to identifying how tele-rehabilitation could be effective, the experiment revealed limitations in the use of technology.

VOA: standard.2010.06.14

Researchers in Melbourne hope to isolate the most effective compounds for use in a potential vaccine.

VOA: standard.2010.01.20