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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When users start the synchronization client software on the device, they choose which subscription set to synchronize.

当用户启动设备上的同步客户机软件时，他们选择要同步的订阅集。

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This ensures that work items get exactly the policy they require, while removing the need for complex schemes to synchronize service policy caches.

这确保工作条目取得他们需要的策略，并去除对同步服务策略缓存复杂模式的需要。

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They heard how mathematicians have found that the urge to synchronize works inside flocks of birds, schools of fish and certain inorganic objects.

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