以下为句子列表：
英文: An unusually high level of iridium appears at this time in the geologic record and is typically the biggest piece of evidence used in support of this theory.
中文: 在这一时期的地质记录当中，铱的高含量是用来证明这一理论的最有力的证据之一。
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英文: For the oxidase test use a loop or a needle made of platinum-iridium or a glass needle (or a sterile wooden toothpick) but never a nickel-chromium or iron loop (because this give false positive reactions).
中文: 氧化酶试验应使用白金环或针，或玻璃针（或无菌的木制牙签），但不要用镍铬环或金属丝以免引起假阳性。
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英文: Research advances, problems and developing tendency of organic phosphorescent electroluminescent materials with iridium core are reviewed, and the host materials for preparing devices are introduced briefly.
中文: 本文综述了以铱为内核的有机电致磷光材料的研究进展、存在问题和研究趋势，并简要介绍了用于制作有机磷光器件的主体材料。
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英文: Scientists subsequently found enhanced iridium levels at more than 100 end Cretaceous sites worldwide and shocked quartz at more than 30 sites.
中文: 世界各地的白垩纪末期遗址中，科学家发现了超过100处有铱含量高得异常的层位，采集到变形石英标本的遗址也超过30处。
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英文: The standard for the kilogram is a platinum-iridium cylinder kept at the International Bureau of Weights and Standards in Sevres, France.
中文: 千克的标准是指置于法国塞夫勒的国际度量及标准局的白金铱圆柱为准。
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