它是一个过滤器，实际上，只有那些传递给过滤器(即计算true)的元素“向前传给”了循环主体。
It's a filter, and only those elements that pass the filter (that is, evaluate to true) will in fact "carry forward" to the body of the loop.
这些试探起到过滤器的作用，通过参数的设置和调整，可使它更好地达成对主体信息块的抽取。
These heuristics act as filters that can be parameterized and toggled to perform the web block information extraction.
因为地坑过滤器主体部分是开孔滤筒结构，所以本文对该结构进行简化，从筒型结构、开孔对筒型结构的影响这两个方面进行研究。
Since the main part of containment sump strainer is strainer-surfaced cylinder, this paper simplifies the structure from two aspects, tube structure and the influence of strainer.
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