如果同时有太多执行绪，则其中多数的进度会相当缓慢。
If there are too many threads, most of them will not make significant progress.
不过，如果您建立含有函式评估的执行绪，则该执行绪会视为一般程序执行期间中的执行绪处理。
However, if you create a thread with a function evaluation, the thread is treated the same as it would be during normal program execution.
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