题干

小汽车的前挡风玻璃有一定的倾斜角度,而卡车、公交车等大型车辆的前挡风玻璃却几乎是竖直的.请用光学知识分析小汽车前挡风玻璃这样安装的原因.

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解:为保证夜间行车的安全.小汽车前挡风玻璃倾斜安装是因为后面车辆射来的光,照射到前挡风玻璃后,斜向下反射;当车内景物被照亮时,通过前挡风玻璃所成的像在驾驶员前面的斜上方.这样车内驾驶员不至由于反射光而受到干扰,而大卡车、公交车的驾驶员位置较高,司机视线是向斜下方观察的,因此不会受到直接的干扰.

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       What is the best-selling book in the world? Is it the Harry Potter series or Secret Garden? According to the Guinness World Records, the Xinhua Dictionary, published by the Commercial Press in China, is the world’s most popular dictionary and the best-selling book.

       In 1950, Chinese language experts(专家) and scholars, Wei Jiangong and Ye Shengtao, started to edit(编辑) the Xinhua Dictionary. There was a lot of discussion, research and paper work. Some hand scripts (稿件) were checked again and again like compositions, People's Daily reported. Many people's hard work and interesting stories went into making the dictionary.

        In 1953, the first Xinhua Dictionary was published. Today, 567 million copies of the dictionary have been sold worldwide

      However, revisions (修订) to the dictionary continue to be made. According to Yu Guilin from Commercial Press, editors(编辑) usually summarize (总结) the meaning of words again while revising. If the example sentences are out of date, editors need to have experiences and make new examples. “To give a correct explanation of the word ‘焗油 (deep condition)’ , one editor went to a barber shop (理发店) to experience it for himself,” Yu told the Beijing Times. So far, the Xinhua Dictionary has been revised 11 times.

     To keep up with the times, some popular and widely used internet words are also added to the dictionary. For example, in the 11th edition, the phrases “晒工资 (show off salary)” and “晒照片 (show off pictures)” were included.

       All these efforts create the “National Dictionary” of China. The Xinhua Dictionary is not only a useful tool for generations of Chinese people. It also helps foreigners who are learning the Chinese language and culture.