用于实验的动物数量在过去二十年中大大减少了。

The number of animals used in experiments has greatly declined in the past twenty years.

youdao

随着研究技术的日益先进，用于实验的动物的数量可能会减少。

As research techniques become more advanced, the number of animals used in experiments may decrease.

youdao

随着研究技术变得更加先进，用于实验的动物数量将会大大减少。

As research techniques become more advanced, the number of animals used in experiments will greatly decrease.

youdao

So this diet, although it's processed by a company and sold for people doing animal studies, it more or less mimics what these animals might be eating under natural conditions.

尽管这些食物经过商业加工,并用于动物科学研究,但会尽可能的模拟,实验动物在自然环境下的饮食

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选