默认的值或无效的值表示缺少完整性检查，或者未知的标准。
The defaulted or invalid data is Indicative of either a lack of integrity checks, or unknown criteria.
检查信息的完整性：通过网页更新信息，然后通过搜索检索信息，确保在后台数据库更新了它的(属性)值。
Check out the integrity of information: update the information through web and then recall that information through search to make sure it is updated property in the back end database.
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