It shows how the data structure USES collections (like HashMap or Vector) to structure the elements of the data structure.

它显示了数据结构如何利用集合(如hashmap或Vector)来设定数据结构的元素的结构。

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The bigger problem with the synchronized Collections wrappers, and the earlier Hashtable and Vector classes, is that they synchronize on a single lock.

同步的集合包装器以及早期的Hashtable和Vector类带来的更大的问题是，它们在单个的锁上进行同步。

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