这其中的窍门就是创造一种能够迅速和精确地定义一个过程的方法，而且这种方法不能使控制逻辑变得过分复杂，以至于增加大量开销而无法实现。
The trick has always been to create a method of defining a process quickly and precisely without adding so much complexity to the control logic that it becomes too expensive to implement.
这种方法显然比前面显示的基于密码的方法提供更加精确的访问，并且推荐需要多级访问控制的应用程序使用该方法。
This approach obviously offers more precise control than the simple password-based authentication shown earlier, and is recommended for applications that require multiple levels of access control.
他提醒说，这一比较并不精确，因为美国疾病控制与预防中心对季节性流感有不同的统计方法。
The comparisons aren't exact, because the CDC calculates deaths from seasonal flu differently, he cautioned.
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