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，这一点在新收录的资料中也有详细论述
Furthermore, specialization only relaxes but not completely removes the rules for overlapping implementations. For instance, it is still not possible to define multiple overlapping implementations that are equally general, even with the use of specialization. Specialization also doesn't address the orphan rules. So we still cannot define orphan implementations outside of crates that own either the trait or the type.
十年后，可能我们都不需要 iPhone 了。