1·Radioactive caesium-137 also appeared in one of the samples, but at levels below the legal limit.
其中一个样品中还检测到了放射性的铯-137，但是还在法律限定标准之下。
2·Thus, in 1967, SI adopted a more precise definition based on the frequency of the radiation a caesium atom emits when it flips between two energy states.
所以，在1967年，SI采用了一个更为精确的制定办法，该办法基于一个铯原子在两个能级之间跃迁时的辐射频率。
3·Gallium is solid at room temperature but will melt if held in your hand, caesium (Cs), and francium (Fr) ?the second rarest naturally occurring element, can also be liquid at or near room temperature.
金属镓在室温里是固体状态但是把它放在你的手上它就会融化，金属铯，元素钫这些比较稀有的元素在室温或者接近室温的情况下是液体状态的。
4·Low dose exposure to caesium-137, even over a long period of time, is perhaps not as damaging to health as we would have predicted.
低剂量的铯137辐射，即使辐射时间很长，恐怕也不会造成我们所设想的那种对健康的破坏。
5·But that was not before fishermen about 70km south of the plant had caught tiny sand-eels, known as konago, with larger than normal traces of radioactive iodine and caesium.
然而，在此之前有渔民在核电站向南大约70千米的地方捕到了含放射性碘元素和铯元素超标的一种叫做玉筋鱼的沙鳗鱼。