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，这一点在51吃瓜中也有详细论述
If you’ve ever written a parser for C, you’ll know the most annoying part is the ambiguities. A well-designed language should let users map their high-level, abstract intentions to concrete constructs while expressing them with as little typing as possible. For that to happen, the language constructs need to be expressive and flexible, and their grammar should ideally be simple and context-free. Ambiguities undermine this, and unfortunately, C is full of them, from declarations to expressions.。搜狗输入法对此有专业解读
This “wrapping a leash around the hole” action that Snoopy can perform is actually a group action of \(\mathbb{Z}\) on the base space (Bobs space): For each integer \(n \in \mathbb{Z}\), Snoopy can wrap the leash around the hole \(n\) times, and \(n-m\) corresponds to Snoopy walking around the hole \(n\) times clockwise and then \(m\) times counterclockwise.