手机麻将娱乐

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                > 在线听力 > 英语高级听力 > 英语时差 >  第367课

                英语时差:耐辐射异常球菌

                所属教程:英语时差

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                xijijun

                2019年12月22日

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                https://online2.tingclass.net/lesson/shi0529/10000/10183/367.mp3
                http://image.tingclass.net/statics/js/2012
                Conan the Bacterium. That’s the playful name given by biologists to an organism whose official moniker is “Deinococcus radiodurans.” D. radiodurans is microscopic, but that doesn’t mean it’s a pushover. It can take heat, cold, long periods of desiccation. In fact, D. radiodurans is so tough that you can’t even kill it with intense radiation–almost a sure-kill treatment for living things. Let’s use ourselves as an example. Very high-energy photons are called “gamma rays,” and they are measured in rads. Moderate energy photons, such as those coming from the sun and landing on you right now, aren’t too dangerous. Gamma rays, however, are another matter. About one thousand rads of gamma rays will kill a person.
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