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汉语拼音：yuán zǐ dàn

利用重元素原子核裂变瞬间释放巨大能量产生杀伤破坏效应的核武器。主要组成部分是核装料（铀-235、钚-239等）、引爆装置、中子源、反射层和外壳。当引爆装置爆炸使核装料超过临界质量时，在中子作用下，引起核裂变的链式反应，在极短的时间内放出巨大能量，发生猛烈爆炸。

1. 炸弹的一种，利用铀、钚等重元素原子核裂变于瞬间放出巨大能量起杀伤破坏作用的武器。爆炸时产生冲击波、光辐射、贯穿辐射和放射性沾染。

   巴金 《探索集·长崎的梦》：“当时在原子弹爆炸中心附近有一所小学，一千五百个学生中一千四百人死亡。”

• In the United States enough time, energy and money that could have been used to erect new cities, were spent to build atomic bombs.

  美国为着造原子弹所用去的时间，精力和金钱，足够建立好几个新的城市了。

• In the last months of his presidency, Mr Chirac mused publicly that it might not be so dangerous after all if Iran acquired a nuclear bomb.

  在卸任前几个月，希拉克就曾对公众意味深长地说，如果伊朗拥有了原子弹，也许并没有那么危险。

• The next day, in order to curb the spreading of the war and out of the thinking of trial, America cast the first bomb on Hiroshima.

  于是在8月6日，一方面为了阻止战争的继续蔓延，一方面出于试验的心理，美国向广岛投放了第一颗原子弹。

• The book was to be an account of what important Americans had done on the day when the first atomic bomb was dropped on Hiroshima, Japan.

  这将是一本记录在世界上第一枚原子弹被投掷在日本广岛那一天，那些地位显赫的美国人所作所为的书。

• "Is there some special meaning of nuclear contamination for a nation that has been bombed by an atomic bomb? " he said.

  对一个曾经遭受原子弹轰炸的国家来说，核污染特别吗？

• Continuous farting for six years and nine months would create energy equal to that of an atomic bomb.

  连续放屁六年九个月，威力相当于一颗原子弹。连续放屁六年九个月，威力相当于一颗原子弹。

• For an entire city to be wiped out in seconds by one bomb was more like a force of nature.

  而之后整座城市在几秒钟内被一颗原子弹夷为平地则更像是一种自然力所为。

• In the dark world of warfare, each new tool is a more effective way to harm people. The A-bomb could be the point of no return.

  在战争的黑暗世界里，每一个新的工具都是更有效地杀人工具，就像原子弹那样成为一条不归之路。

• He said that Libya "crossed the Red Line" and came to the point where it was able to build an atomic bomb. But, he added.

  卡扎菲上校说，利比亚“越过了红线”，到了它能制造原子弹的水平。