The WHO authorized drug manufacturers to begin testing possible vaccines, and the first human trials began a month later.

VOA: standard.2009.12.25

Because usually it doesn't work. And so one of the things that I think is very important is to always begin by testing each unit.

因此我认为非常重要的一件事情,就是开始测试的时候先对,每个独立单元进行测试。

麻省理工公开课 - 计算机科学及编程导论课程节选

Sanaria is now preparing to ask the United States Food and Drug Administration for approval to begin federal testing of the vaccine.

VOA: special.2010.04.20

Testing of SpaceShipTwo is expected to begin next year.

VOA: special.2009.12.18