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发表于:2018-12-11 / 阅读(89) / 评论(0)

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发表于:2019-01-18 / 阅读(83) / 评论(0)

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发表于:2019-01-30 / 阅读(183) / 评论(0)

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Compared to the dose level of a medical chest x-ray, a backscatter scan is thousands of times lower. Since the Christmas Day attempted bombing of a U.S. airliner, airports are looking for ways to tighten security. One method being adopted by some and

发表于:2019-02-05 / 阅读(73) / 评论(0)

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发表于:2019-02-23 / 阅读(72) / 评论(0)

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Ana: Hey, Michael. I heard your mom is a zoologist. What is it exactly? Mike: A zoologist. Well, that's true. She is a zoologist. So a zoologist is someone who studies animals. Ana: Oh, interesting. So does she study all animals or does she focus on

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