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Update ch17-02-trait-objects.md

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@ -258,13 +258,12 @@ objects. Clone is an example of one. You'll get errors that will let you know
if a trait can't be a trait object, look up object safety if you're interested if a trait can't be a trait object, look up object safety if you're interested
in the details"? Thanks! /Carol --> in the details"? Thanks! /Carol -->
Not all traits can be made into trait objects; only *object safe* traits can. A 不是所有的trait都可以被放进trait对象中; 只有*对象安全的*trait可以这样做. 一个trait只有同时满足如下两点时才被认为是对象安全的:
trait is object safe as long as both of the following are true:
* The trait does not require `Self` to be `Sized` * 该trait要求`Self`不是`Sized`;
* All of the trait's methods are object safe. * 该trait的所有方法都是对象安全的;
`Self` is a keyword that is an alias for the type that we're implementing `Self`是一个类型的别名关键字，它表示当前正被实现的trait类型或者是方法所属的类型that is an alias for the type that we're implementing
traits or methods on. `Sized` is a marker trait like the `Send` and `Sync` traits or methods on. `Sized` is a marker trait like the `Send` and `Sync`
traits that we talked about in Chapter 16. `Sized` is automatically implemented traits that we talked about in Chapter 16. `Sized` is automatically implemented
on types that have a known size at compile time, such as `i32` and references. on types that have a known size at compile time, such as `i32` and references.