在 Rust 中 &str 是字面量值, 程序编译成二进制文件后，这个字符串会被保存在文件内部, 为了保持这个字符串在固定位置的引用, 所以要加引号.由于已经被保存在文件内变成了二进制, 所以不需要生命周期, 它是Static的, 整个程序的任何时候都能访问.
而 String 它其实是Vec的一种实现.
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