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1、把下列各句译成汉语，注意下划横线的词：1. As is known to air, air is a mixture of gases.众所周知，空气是多种气体的混合物。2. Mercury is by no means abundant nor widely distributed.水银的贮藏量并不丰富，分布也不广。3. It is known to all that acids turn blue litmus red.众所周知，酸类能使蓝色石蕊变红。5. They have fulfilled their work ahead of schedule, so have we.他们提前完成
2、了他们的工作，我们也提前完成了我们的工作。6. Now, radar is a commonly used technique by which people can see the things beyond their visibility. 现今，雷达是一种常用的技术，利用雷达人们可以看到视线以外的东西。7. There are two approaches to stabilization of the operating currents and voltages.要稳定工作电流和电压有两种方法。8. The laser is able to amplify light, where
3、 necessary, millions of times.激光可以放大光线，必要的时候可以放大数百万倍。9. The result of the check indicated that actual error probabilities were of the order of one percent.检查的结果表明，实际的误差概率大约是 1%。10. The investigation into this mechanism was done by halves.这种机械结构的调查研究尚不完全。11. From Shanghai to Nanjing, the truck runs every six days.从上海到南京，这辆卡车每隔五天一趟。12. Today the speed of our car exceeds the ordinary speed by a factor of three.今天，我们的汽车速度超过了平常的两倍。13. The sales of industrial electronic products have multiplied six times since 1950.1950 年以来，工业电子产品的销售额增加了五倍。
