In the Superman stories, Kryptonite is a kind of rock from Superman’s home planet, Krypton. Near it, he becomes weak and can even die; without it, almost nothing can hurt him.

In the Superman stories在超人的故事裡, KryptoniteKryptonite(氪石) is a kind of rock是一種岩石 from Superman's home planet, Krypton來自超人的故鄉星球Krypton(氪星)。Near it靠近它的時候, he becomes weak他會變虛弱 and can even die甚至可能死掉; without it沒有它的時候, almost nothing can hurt him幾乎沒有東西傷得了他。

The famous kind is green, though later stories invented other colours with other effects.

The famous kind最有名的那種 is green是綠色的, though later stories invented other colours with other effects不過後來的故事又發明了其他顏色、有不同的效果。

People also stretch the word in ordinary talk: they call something “someone’s kryptonite” when it is the one thing that can stop a strong person — a fear, a subject at school, a type of problem. That second use is informal, from comics and films, not from science.

People also stretch the word in ordinary talk人們在日常說話裡也會延伸這個字: they call something 'someone's kryptonite'把某樣東西叫做「某人的kryptonite」 when it is the one thing that can stop a strong person當它是唯一能打倒一個強者的東西 — a fear, a subject at school, a type of problem不管是一種恐懼、學校的某一科，還是某種問題。That second use這第二種用法 is informal是非正式的, from comics and films來自漫畫和電影, not from science不是來自科學。

The name is the planet Krypton plus -ite, a usual ending for rocks and minerals. The planet itself was named after the real gas krypton.

The name這個名字 is the planet Krypton plus -ite是星球Krypton加上字尾-ite, a usual ending for rocks and minerals這是岩石和礦物常見的字尾。The planet itself這顆星球本身 was named after the real gas krypton是用真實存在的氣體krypton(氪)命名的。

You will almost always see a capital K, because it started as a story name.

You will almost always see a capital K你幾乎總是會看到大寫的K, because it started as a story name因為它一開始就是個故事裡的專有名詞。