The notes C and G feel closely related to each other because of their shared harmonic relationship. The chords you get from their respective overtone series also feel related. If you alternate between C major and G major chords, it just about always sounds good.
This is a huge problem of slow-to-respond standardization processes! They run the risk of becoming increasingly irrelevant, and the issues which they had hoped to solve (e.g. portability) once again become everybody's problem. This applies not just to POSIX but to everything, including C's slow efforts to modernize itself.。关于这个话题，PDF资料提供了深入分析
，这一点在新收录的资料中也有详细论述
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A Brief History of HTTPS and WebPKI。业内人士推荐PDF资料作为进阶阅读