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Update ch19-02-advanced-lifetimes.md

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