... triggers ['trigə] 触发 Extended objects 对象扩展 Aggregate objects ['ægrigeit] 总计对象 ...
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如果有可能，我极力建议您用定制对象扩展现有的集合。
If at all possible, I strongly recommend you have your custom objects extend an existing collection.
WeakHashMap的实现展示了弱引用的一种常见用法——一些内部对象扩展WeakReference。
The implementation of WeakHashMap illustrates a common idiom with weak references — that some internal object extends WeakReference.
Hibernate 查询语言（HQL）被设计成 SQL 的一个微型面向对象扩展，它是对象和关系世界之间的桥梁。
The Hibernate Query Language (HQL), designed as a minimal object-oriented extension to SQL, is an elegant bridge between the object and relational worlds.
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