比较医学是通过实验动物来研究人类各种疾病，从而为保护和增进人类健康服务的综合性学科。
Comparative medicine is a synthetical subject, to provide protection and improve healthy medicare of human being by studying all kinds of human diseases using laboratory animals.
动物园使人们无需前往野外地区（就能看到动物），从而为野生动物保护做出了贡献。
Zoos save people trips to wilderness areas and thus contribute to wildlife conservation.
设立禁飞区是为了停止卡扎菲动用空军，进而为利比亚平民提供不少保护，但禁飞区的有效时刻将很快过去。
The moment will soon have passed when a no-fly zone designed to stop Colonel Qaddafi from using his air force could offer civilians much protection.
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