（6）缺省与规则(Defaults and rules) 缺省是在数据录入时，若用户没有输入数据，SQL Server自动输入的值。
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defaults and rules
默认值和规则
以上为机器翻译结果，长、整句建议使用 人工翻译 。
His or her loan will be modified (interest rate reduced or principal forgiven) and because of new more lenient HAMP rules, when she or he defaults again, the loan can be rejiggered yet one more time.
FORBES: Meet The New Subprime: It Will Cost Us Billions
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