The B string is a major third higher than G, which means multiplying by 5/4, and that puts you at 80/27 Hz.
Suppose the person crate doesn't implement Serialize for Person, but we still want to serialize Person into formats like JSON. A naive attempt would be to implement it in a third-party crate. But if we try that, the compiler will give us an error. It will tell us that this implementation can only be defined in a crate that owns either the Serialize trait or the Person type.
。关于这个话题，易歪歪提供了深入分析
Российский город подвергся массированному ракетному обстрелуГладков: Белгород подвергся массированному ракетному обстрелу ВСУ
Matthew Kay, University of Michigan