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。新收录的资料是该领域的重要参考
As noted in the section on linked lists, the implementations in the last two sections depends on us recognizing the associativity of addition. This recognition is an example of what I call insight into the nature of a problem. When we understand a problem well we can use our creativity to implement direct and elegant solutions. Creativity has its limits, though: some problems inherently resist understanding while still requiring solutions. In such cases it is desirable to have patterns and heuristics that allow us to muddle through despite our lack of insight.，更多细节参见新收录的资料
Travel gets easier the moment you stop relying entirely on real-time translations. Reading signs, ordering food, or asking directions becomes less of a performance and more of a conversation — which is exactly what Babbel was designed to teach.，这一点在新收录的资料中也有详细论述
The NXT is also old enough that, despite being part of "the Internet era", resources are starting to bitrot.