它们也提供不同的观点，因此研究人员可以旁观事态的变化，或者参与其中。
They also provide different perspectives, so the researcher can watch the scenario from above or be immersed into it.
有益的真实生活的案例分析也包含在其中，为读者在如何看待和应用产业网络安全上提供不同的观点。
Informative real-world case histories are also included to give the reader different perspectives on how industrial network security is viewed and applied.
实际上，在20年间约60人持续服用阿司匹林5年，才能预防一例因肠道癌死亡，他说，其明显的好处是能给需要决定是否服用阿司匹林的人提供不同的观点。
'in effect, around 60 people would have to take the aspirin continuously for around 5 years to prevent one death from bowel cancer during a 20-year period,' he says.
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