我们需要准确指出答案在技术文档中的出处，所以如果任何人怀疑考试的有效性，可以提供证明它有效的证据。
We need to source exactly where in the technical documentation the answer appears, so that if anyone challenges the validity of the exam, its validity will stand up in court.
这使得考试变得不公平也缺乏有效性。
郑英：考试的有效性与安全性是非常重要的因素。
Zheng Ying: test validity and security are very important features of a test.
该文提出人工阅卷的网上考试方案，利用群签名的思想，达到考生试卷匿名的要求，同时保证了网上考试的安全性问题，从而很大程度上扩大了网上考试的范围及有效性。
This paper proposes a new scheme for manual grading of network examination and uses the method of group signature in order to meet the requirement for anonymity of examinee's paper.
而唐静也指出，已经拿到四六级证书，或是正在为下个月的四六级考试临阵磨枪的同学们也完全不必担心考试结果的有效性。
However, Tang also noted that for those who already have CET certificates or are now *cramming for next month's CET-4 and CET-6, there's no need to worry about the effectiveness of the tests' results.
而唐静也指出，已经拿到四六级证书，或是正在为下个月的四六级考试临阵磨枪的同学们也完全不必担心考试结果的有效性。
However, Tang also noted that for those who already have CET certificates or are now *cramming for next month's CET-4 and CET-6, there's no need to worry about the effectiveness of the tests' results.
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