The paddocks will need water. Some farmers design a path for animals from different paddocks to drink from a common watering place.

VOA: special.2009.01.06

Is it true that animals need reinforcement and punishment to learn?

动物真的需要强化和惩罚才能进行学习吗？

耶鲁公开课 - 心理学导论课程节选

To fill this culture dish with inner ear cells you would need the equivalent of 40 experimental animals.

用内耳细胞填满这个培养皿,你得需要四十只试验动物。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

And while they eat the grass, they may need guard animals to protect them from animals that would like to eat them.

VOA: special.2010.01.19

Grasslands need time to rest when cattle and other animals feed on them.

VOA: special.2010.01.19

They may need stronger fences than other animals.

VOA: special.2010.01.19

"We need to recognize at the outset that what we do to animals from their perspective certainly, and probably from ours is morally wrong and unacceptable, and that it's really important to follow through on all these exciting new leads into ways of doing research without using animals."

VOA: standard.2010.02.16