并行性是通过运行主线程为每一个任务调度执行的子线程而实现的，这样任务就会并发执行，而每一个线程是同步执行任务的。
Parallelism is introduced by running the main thread scheduling child threads for each task so that the tasks execute concurrently while each thread execute the task synchronously.
一个托管编程模型，支持数据并行处理，任务并行处理，并通过一个通用的工作调度器统一协调并行运行的硬件。
A managed programming model for data parallelism, task parallelism, and coordination on parallel hardware unified by a common work scheduler.
因为在单元测试中的并行任务通常很小同时也很少，在调度程序切换线程之前它们通常一直运行到结束，除非强迫它(也就是通过wait )。
Because concurrent tasks in unit tests are usually small and few, they usually run to completion before the scheduler switches the thread, unless it is forced to (say, by wait ).
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