However, when data is not clean, the duplicate records get dropped and there is less data to load into the database. This reduces loading time.
但是，当数据不干净时，副本记录将被弃用，只需将较少的数据加载到数据库，这将减少加载时间。
With many villages having no clean water or basic sanitation, let alone reliable access to clinics and doctors, modern wizardry like molecular diagnostics and digital medical records seem irrelevant.
许多村庄都没有清洁的饮水或基础卫生建设，要谈诊所和医生、现代科技的巫术、例如分子诊断和数位医疗纪录，还真是天方夜谭。
Sometimes an application needs to delete all records from a given table to clean up a log or reload sales data for a new month.
有时候应用程序需要从给定表中删除所有的记录，以便清空日志记录或者装入新的一个月的销售数据。
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