将＆[Box <[u8]>]转换为字符串或＆str

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What's an efficient way to convert a result of type &[Box<[u8]>] into something more readily consumed like String or &str?

An example function is the txt_data() method from trust_dns_proto::rr:rdat::txt::TXT.

我尝试了几项似乎无济于事的事情，例如：

fn main() {
    let raw: &[Box<[u8]>] = &[b"Hello world!"
        .iter()
        .copied()
        .collect::<Vec<_>>()
        .into_boxed_slice()];

    let _value = raw.iter().map(|s| String::from(*s)).join("");
}

Where res is of that type.