A new study in the journal Nature has shown some hopeful results from an experimental gel that might protect women from H.I.V.

VOA: special.2009.03.16

So, this will remind you that physics is, after all,an experimental science and you will be able to see where all the laws of physics come from.

因此,实验能提醒你,物理毕竟是一种实验科学,这样你就能明白所有的物理定律是从何而来的

耶鲁公开课 - 基础物理课程节选

The group says it could be hard to stop experimental organisms from entering the natural environment.

VOA: special.2010.07.20

These experimental AIDS vaccines are the first from Africa to reach testing in people.

VOA: special.2009.07.29