目的在相对洁净环境下使用IVC系统，观察长期饲养s PF级大鼠的效果。
Objective To explore the effectiveness of permanently breeding SPF rats in individually ventilated cage (IVC) system with ing relative clean environment.
房主们长期饲养野生鸟类，但只有现在，科学家最终才明白这是如何影响城市生态系统的。
Homeowners have been feeding wild birds for a long time, but only now are scientists finally beginning to understand just how that affects urban ecosystems.
比如，他们饲养犬类，从卷毛到大丹，他们种植玫瑰，从散发出甜美气味的小玩意到今天能长期保鲜且无气味的大红。
For example, they produced dogs ranging from poodles to Great Danes, and roses from sweet-smelling miniatures to today's long-lasting, but scent-free reds.
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