当汽车变得自动化，我们不需要的时候他们就可以自行充电，那么汽车就不会被每天闲置22小时了。
Why should cars sit idle for 22 hours a day -- as mostdo -- when they could be robotic taxis, plugging themselves into an electricaloutlet when not needed?
由于客户机不希望强制断开连接，因此，当连接闲置的时间为此参数指定的秒数时，客户机将自动发送 keep-alive 消息。
Since clients do not wish to be forcefully disconnected, they will automatically send a keep-alive message if the connection is inactive for the number of seconds specified by this parameter.
当程序运行时，Cilk系统会自动将“引发计算”分配到闲置的处理器。
When the program is running, the Cilk system automatically allocates the spawned computation as many cores as are free to handle it.
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