his blue eyes still burning like pieces of kryptonite behind the lenses of glasses.
中的kryptonite究竟是什么？谢谢

Kryptonite is a fictional substance from the Superman radio show series (and subsequent related media, most notable the comic books). The word kryptonite is used in speech to describe someone's or something's weakness. The material, usually shown as having been created from the remains of Superman's native planet of Krypton, generally has detrimental effects on Superman. The name "kryptonite" covers a variety of forms of the substance, but usually refers to the most common "green" form.

Kryptonite was produced from the material of Krypton, when it was destroyed in an explosion. It is usually found in the form of a glowing green rock or metal, but crystalline forms have also made appearances (most notably jewel kryptonite; see forms of kryptonite) along with different-colored variants, such as the red or silver forms

即能杀死超人的氪星物质。由这The name "kryptonite" covers a variety of forms of the substance, but usually refers to the most common "green" form.可知，它常被用来表示绿

他那双眼睛镜片后的蓝眼睛仍然闪烁着道道绿光。

翻译得好像很恐怖。呵呵，反正给你参考一下，你自己思考一下吧。

参考文献：http://en.wikipedia.org/wiki/Kryptonite