Imagine a world with no more animals: no elephants, no tigers or lions.

想象一个不再有动物的世界：没有大象、老虎或狮子。

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Sea turtles, polar bears and giant pandas are just some of the thousands of animals in this world that are at risk of extinction.

海龟、北极熊和大熊猫只是世界上成千上万濒临灭绝的动物中的一部分。

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Animals can make us happy, and we can not live without animals in the world, so we should protect animals and love animals.

动物能使我们快乐，世界上不能没有动物，所以我们要保护动物、爱惜动物。

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The World Heritage Committee said increased tourism,immigration and invasive species threaten the animals of the Galapagos.

VOA: special.2009.12.16

The beauty of the world, the paragon of animals and yet, to me, what is this quintessence of dust?

宇宙之华，万物之灵,但对于我，这尘土的精华又算得了什么？

耶鲁公开课 - 公正课程节选

But in the real world when dealing with humans, but even when dealing with animals, we don't actually always use primary reinforcers or negative reinforcers.

但当我们在现实中训练人类，甚至是训练动物时，我们实际上并不总是用到初级强化物,或是负强化物。

耶鲁公开课 - 心理学导论课程节选

Some poorly sourced reports placed the earlier number as low as 5, 000 animals world-wide, and in 1965, top scientists reported that extinction was in sight.

WSJ: Are Polar Bears Really Disappearing?

Nongovernment organizations, including World Society for Protection of Animals, World Wildlife Fund and Unesco Rapid Response, have stepped in with funding and with help training farmers.

WSJ: Elephants Now Think Twice About Midnight Snacks in Tanzania

Of all the animals in our world, humans have the deepest emotional ties with horses and dogs.

CNN: Should I still be grieving my horse's death?