The nineteen thirties also gave us a superhero who came to earth from the planet krypton .

在二十世纪三十年代还出现了一位超级英雄，他从氪星来到了我们的地球上。

First , a range of less-dangerous gases are liberated , including tritium , krypton and xenon .

首先会释放一系列危险性较低的气体，如氚、氪和氙。

Superman you see has just returned to earth after a five-year absence spent searching for his lost homeworld krypton .

而超人呢，他刚回到地球，之前他花了5年时间去寻找他失落的故园氪星。

In particular , the researchers were studying the isotope ratios -- or the comparative abundances of the different forms of a particular element -- of the gaseous elements krypton and xenon .

特别一提，研究人员对其同位素含量进行了分析：即特殊元素的不同形式氪和氙在气体中所含的相对丰度。

Weiss had to distill , heat and pass the air samples over adsorbents to remove gases such as carbon dioxide and krypton that could foul the extremely sensitive detector .

维斯必须蒸馏、加热并使空气样品通过吸附剂，以除去二氧化碳和氪等会污染极灵敏的探测器的气体。