不仅仅是他为水而忧虑。
每个机器人“能够胜任两个半普通工人的工作量”，这样人们就可以无忧无虑地享受无任务，无工作，无忧虑的生活，而不用事事亲历亲为。
Each robot “can do the work of two-and-a-half human laborers,” so that humans might be free to have “no other task, no other work, no other cares” than perfecting themselves.
我为自己的智力而忧虑。
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