研究生科技英语阅读课文翻译对照(17)

许多专家建议人们凭常识办事。“我们不会对孩子们说：‘好，去肮脏的河边玩吧，想抓什么就抓什么。’”温斯托克(Weinstock)医生说，“但可以这样讲，小孩子玩泥巴没什么大不了的，他们不必生活在完全干净的环境中，也不会因为吃掉到地上的东西就死掉。这样说不定会使他们更健康。”
Unit 4 Is Time Travel Possible?
Hello. My name is Stephen Hawking. Physicist, cosmologist and something of a dreamer. Although I cannot move and I have to speak through a computer, in my mind I am free. Free to explore the universe and ask the big questions, such as: is time travel possible? Can we open a portal to the past or find a shortcut to the future? Can we ultimately use the laws of nature to become masters of time itself?
大家好，我是斯蒂芬-霍金，是物理学家、宇宙学家及梦想家，尽管身体不能活动，只能通过电脑与大家交流，但从内心中我是自由的，自由地探索宇宙，思考以下重大问题：时间旅行是否可行？能否打开一个回到过去的通道，或找到通向未来的捷径？我们最终能否利用自然规律成为掌控时间的主人？
To see how this might be possible, we need to look at time as physicists do - at the fourth dimension. It"s not as hard as it sounds. Every attentive schoolchild knows that all physical objects, even me in my chair, exist in three dimensions. Everything has a width and a height and a length.