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要求的检查
1、action required───需要采取的行动
2、examination───n.考试；检查；查问
3、required course───n.必修课程
4、required for───要求……（required是require的过去式和过去分词）
5、required field───必填项；必填字段
6、if required───如果需要
7、required───adj.必需的；（美）必修的；v.需要（require的过去式及过去分词形式）；要求
8、entrance examination───n.入学考试
9、required cl───所需cl
1、The government said it was studying the implications, which required very careful examination and consideration.───政府称正在对可能的影响进行研究，而这“需要仔细的审查和考虑”。
2、This article presents a complete examination of the local mail replica model, focusing on the steps required to fully implement the environment both from a manual and automated process.───本文给出了本地邮件副本模型的全面分析，重点讨论了通过手动和自动方式完整实现环境所需的步骤。
3、The Mobile Law also required a doctor's examination for all lodge members and forbade all speculative enterprises such as the extension of credit to members.───流动法还要求对所有分会成员进行医生检查，并禁止所有“有投机行为”的机构，例如对会员延长贷款期限。
4、You have to pass the required examination to become a doctor.───你需要通过规定的考试才能成为医生。
5、CONCLUSION: OCT has a very good detection specificity and sensitivity for PVD, therefore it can be used us the required examination.───结论：OCT对玻璃体不完全后脱离的检出具有非常好的特异性和敏感性，可作为玻璃体后脱离的必需检查手段。