如果组合键是标准，那么就不可能很快发生变化。
If composite keys are the standard, then that's not likely to change any time soon.
这样的重复是创建组合键所必需的。
某些时候使用组合键的原因是所选键在某些方面与最终用户的业务领域相关联。
Composite keys are sometimes used because the choice of key relates in some way to the end-user business domain.
此注释是组合键拼图中的第一块。
This annotation is the first piece of the composite key jigsaw puzzle.
组合键的缺点是设计和编码略有难度。
The downside to composite keys is that they are a little difficult to design and code.
清单2中的下一个注释是 @IdClass，它定义组合键类引用。
Next up in Listing 2 is the @IdClass annotation, which defines the composite key class reference.
清单2中的下一个注释是 @IdClass，它定义组合键类引用。
Next up in Listing 2 is the @IdClass annotation, which defines the composite key class reference.
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