禽流感的出现给科学家设计疫苗带来极大的挑战，因为禽流感可感染许多不同的动物，包括鸟禽、宠物和人类。
The emergence of bird flu has posed a major challenge to scientists designing vaccines as it can infect a number of different animals, including birds, pets and people.
狐狸也会吃水果蔬菜，鱼，青蛙甚至害虫，如果同人类居住，狐狸也会见机行事的以去吃残羹冷炙和宠物食品。
Foxes will eat fruit and vegetables, fish, frogs, and even worms. If living among humans, foxes will opportunistically dine on garbage and pet food.
的确，每次地震或海啸过后，各种动物(尤其是宠物和家畜)表现异常或者是能比人类早预测灾难的故事就流传起来。
Indeed, following earthquakes and tsunamis, stories often circulate of animals (especially pets and livestock) acting strangely or seeming to know of the disaster long before humans.
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