实现扫描检测器要做更多工作，但是它们能检测更一般类型的问题。
The scanning detectors are more work to implement, but they are also more general in the sort of problems they can detect.
所有字节码扫描检测器都基于visitor模式，FindBugs实现了这个模式。
All bytecode scanning detectors are based on the visitor pattern, which FindBugs implements.
我们的检测器只需要在字节码扫描阶段维护状态，因为我们查找的是方法级的问题。
Our detector needs to maintain state only during the byte code scanning phase, because we're looking for a method-level problem.
这幅显微照片是通过扫描穿过样品的电子束而获得的，同时检测器对从样品表面反弹的电子进行追踪，这些电子显示了标本的外形。
This photomicrograph was obtained by scanning a beam of electrons across the sample while a detector kept track of electrons bouncing off its surface, betraying the specimen's outer shape.
这幅显微照片是通过扫描穿过样品的电子束而获得的，同时检测器对从样品表面反弹的电子进行追踪，这些电子显示了标本的外形。
This photomicrograph was obtained by scanning a beam of electrons across the sample while a detector kept track of electrons bouncing off its surface, betraying the specimen's outer shape.
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