You even know that working too many hours, like multi-tasking, clobbers your productivity.
你甚至也明白长时间的工作，比如同时处理多项任务，会严重影响你的创造力。
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Worse, Select() clobbers the caller’s arguments if it times out and no socket is ready: the caller needs to make a copy of the three lists on each iteration even if nothing happens!