相反，当没有任务要完成时，固定大小的线程池会让所有的线程等待。
In contrast, the fixed-size pool keeps all the threads around waiting for something to do when there are no tasks to complete.
没有任何练习要做，没有语法规则要来，没有任务要完成……一切都是很自然的。
There are no exercises to do, no grammar rules to learn, no tasks to complete... it's all natural.
每周回顾如果你没有太多的任务要完成的话，这并不是很必要的。
Weekly Review. It's not really necessary if you don't have a lot of tasks to process.
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