An A-bomb is an atomic bomb: a hugely powerful bomb whose energy comes from splitting atoms, the tiny pieces that make up matter.

An A-bomb isA-bomb 就是 an atomic bomb原子彈： a hugely powerful bomb威力極大的炸彈， whose energy它的能量 comes from splitting atoms來自分裂原子 — the tiny pieces that make up matter也就是組成物質的微小顆粒

The name is simply a short form of “atomic bomb.” Newspapers and older books used A-bomb a great deal in the twentieth century, especially after 1945. Today people more often say “nuclear bomb” or “nuclear weapon,” but A-bomb is still understood.

The name這名字 is simply就只是 “atomic bomb”“atomic bomb” a short form of的縮寫。Newspapers and older books報紙和比較老的書 in the twentieth century在二十世紀 especially after 1945、尤其是1945年之後， used A-bomb a great deal大量使用 A-bomb。Today今天 people人們 more often say更常說 “nuclear bomb”核彈 or “nuclear weapon,”或核武， but A-bomb但 A-bomb is still understood大家仍然聽得懂

It is a heavy, serious word; we do not use it as a joke or for something merely “very strong.” There is a parallel short name, H-bomb, for a hydrogen bomb, which works in a different way and is even more powerful. You will meet A-bomb in history writing more than in everyday talk.

It is a heavy, serious word這是個沉重、嚴肅的字； we我們 do not use it as a joke不拿它開玩笑， or for something merely “very strong.”也不拿它形容只是「很強」的東西。There is有 a parallel short name, H-bomb一個平行的短名 H-bomb， for a hydrogen bomb指氫彈， which works in a different way它的原理不同， and is even more powerful而且威力更大。You你 in history writing在歷史文章裡 will meet A-bomb遇到 A-bomb 的機會， more than in everyday talk比在日常談話裡多