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@ -1,13 +1,13 @@
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## Advanced Lifetimes
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## 高级生命周期
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Back in Chapter 10, we learned how to annotate references with lifetime
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回到第10章, we learned how to annotate references with lifetime
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parameters to help Rust understand how the lifetimes of different references
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relate. We saw how most of the time, Rust will let you elide lifetimes, but
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every reference has a lifetime. There are three advanced features of lifetimes
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that we haven't covered though: *lifetime subtyping*, *lifetime
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bounds*, and *trait object lifetimes*.
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### Lifetime Subtyping
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### 生命周期子类型
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Imagine that we want to write a parser. To do this, we'll have a structure that
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holds a reference to the string that we're parsing, and we'll call that struct
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