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.
用气相色谱-电子捕获器法测定了北京郊区某养鸡场不同生长期的饲养鸡的肌肉、表皮、肝脏、胃、心脏以及鸡蛋、饲料和粪便中hch的残留浓度。
The concentrations of hexachlorocyclohexane isomers (HCHs) in muscle, skin, liver, stomach, heart, eggs, feed and feces of chicken from a poultry farm were determined by GC-ECD.
因为印度星龟不能承受潮湿或长期处于高湿度的环境，所以饲养环境必须保持乾燥。
This area must be kept dry as the Star tortoise cannot tolerate wet or constant high humidity conditions.
因为印度星龟不能承受潮湿或长期处于高湿度的环境，所以饲养环境必须保持乾燥。
This area must be kept dry as the Star tortoise cannot tolerate wet or constant high humidity conditions.
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