以下为句子列表：
英文: Black smog reduced visibility to about fifty yards.
中文: 黑色的烟雾使能见度降到大约五十码左右。
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英文: But not long after that , over 4000 people died as a result of the smog .
中文: 但那之后不久，又有4000多人因为烟雾死亡。
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英文: But this is no longer guaranteed, as the smog of May 14 showed.
中文: 但这已不再是确定无疑的，正如5月14日的大雾所展示的那样。
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英文: Finally, a design example of optical system used for smog attenuation testing system is given to illustrate the effect of spherical aberration on the image beam waist.
中文: 最后通过激光羽烟衰减测试系统中聚光光学系统的设计实例说明了球差对高斯光束像方束腰的影响。
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英文: Great Smog of 1952: A cold fog descends upon London, combining with air pollution and killing up to 12,000 in the weeks and months that follow.
中文: 1952年，1952大烟雾：一股寒冷的雾气混杂着污浊的空气降临到伦敦，造成在接下的数周到数月里累计1万2千人的死亡。
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