As an unexpected epidemic, SARS has exerted an important influence over Chinese tourism.
SARS作为一种突发性的自然灾害，对中国旅游业产生了重大的影响。
And it has exerted an important influence on historiography of Nan-tang in the aftertime.
同时，它对后世南唐史学产生了重要的影响。
The influence exerted by tests has been studied as an important issue in testing field.
研究测试所产生的影响是测试领域的一个重要课题。
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