There are many varieties and grades of paper materials, and whilst it is fairly easy to spot the varieties, it is far more difficult to spot the grades.
纸张材料有许多品种和等级，虽然很容易分辨它们的种类，但要分辨它们的等级就困难得多了。
The white paper represents our whole life and the black spot represents problems in our life.
白纸代表我们的一生，黑点代表我们生活中的问题。
Although "it was not a great piece of work," he says, the topic was hot and the paper earned Hoffmann a finalist spot in the 1955 Westinghouse Science Talent Search.
尽管一霍夫曼的话说“这算不上什么大作”，但这一热门的主题和论文让他入围1955年举办的“西屋天才奖”决赛。
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