使其易于重用。
这种设计使收集器更具实用性，且易于重用。
Such a design makes collectors much more useful and reusable. For the highest level of reuse, an externally configured collector should support these configuration points.
由于它抽象的层次更高，所以通常模式比代码更易于重用。
Due to its higher level of abstraction, patterns are often more reusable than code.
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