在Wikipedia上查找到前几个完全数之后，我可以编写一个测试，它检查实际上是否可以找到完全数。
After checking with Wikipedia to find the first few perfect Numbers, I can write a test that verifies that I can in fact find perfect Numbers.
不久前，要想查找一个电视节目仍非难事。
换而言之，根据一个给定的元素查找其父元素、子元素、前一个或后一个兄弟元素。
In other words, say you have a given element and you want to find its parent element, one of its child elements, or its previous or next sibling element.
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