And that,he says, could require at least three more years of research to reach the point of testing in people.

VOA: special.2009.03.04

Opponents of animal testing are quick to point out that it's not a humane way to learn scientific facts.

动物实验的反对者很快就指出，利用这种方法得到科学事实是不人道的。

需要动物实验吗？ - SpeakingMax英语口语达人