【英语专业通用课程】（第三册）原子能汽车（5/7）
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http://t1.g.hjfile.cn/listen/201309/201309230539158343419.mp3Since a car made up of tons of lead is rather impracticable, the only answer at the moment seems to be the discovery or invention of a metal that will be strong enough to hold in the rays, but at the same time light enough for a vehicle to carry with ease and economy.Most likely this metal would have to be synthetic, since no natural metal except lead has yet proved fit for the job.When this light metal is invented, the motoring world will be well on the way to an atomic car.However, even after the invention of a protective but light metal, two other problems still remain, those of economics and safety.既然用几吨铅制造汽车很不切实际，那么眼下唯一的办法就是找到或发明一种新型金属材料。 这种金属既要有足够的强度，可以遏制辐射射线，同时还要足够轻，可以让汽车轻松负载，而且价格还要适中。 这最有可能是一种合成金属，因为除了铅之外没有一种金属符合这个条件。 这种金属发明以后，世界才更有可能进入原子汽车时代。 但是，即使发明了这种具有防护作用的轻金属，仍然存在两个问题，即经济问题和安全问题。
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