A human being is a soft, weak creature. It needs constant supplies of air, water, and food; it has to spend a third of its life asleep, and it can't work if the temperature is too hot or too cold.But a robot is made of strong metal. It uses electrical energy directly, never sleeps, and can work in any temperature. It is stronger, more efficient - and sometimes more human than human beings.Isaac Asimov was one of the greatest science-fiction writers, and these short stories give us an unforgettable and terrifying vision of the future.人類非常脆弱，除了需要仰賴空氣、水、食物得以維生，一生中有1/3的時間要睡覺，不能在太冷或太熱的環境下工作。但機器人卻完全不同，已堅固的金屬建造，仰賴電能，永遠不需要睡眠，在任何溫度下皆可工作。機器人比人類還要強壯，更有效率，有時還比人類更人性化。傑出的科幻小說作家Isaac Asimov，以這短篇故事，讓我們看見可怕的未來，讓人印象深刻。
