之前介绍过的datamaprepository类及其基类LinkedHashMap都不是线程安全的。

The DataMapRepository class presented previously and its base class LinkedHashMap are not thread-safe.

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也包括几乎所有的基类库(Base Class Library,BCL)，涵盖诸如垃圾收集(Garbage Collection)、线程、数学函数、System.Net、加密等。

It also includes nearly all of the Base Class Library (BCL) including things like Garbage Collection, Threading, Math Functions, System.Net, Cryptography, etc.

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PeriodicThread是基类，从它派生出协作线程组中的worker线程。

PeriodicThread is the base class from which worker threads in the set of cooperating threads must be derived.

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PeriodicThread是基类，从它派生出协作线程组中的worker线程。

PeriodicThread is the base class from which worker threads in the set of cooperating threads must be derived.

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