Petrov's gut feeling was due in large part to his lack of faith in the Soviet early-warning system, which he subsequently described as "raw."

Petrov内心的感觉很大程度上来自他对苏联的早期预警系统缺乏信心。

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But levels of friendly bacteria in the gut drop significantly after 55, particularly in the large intestine, says Tom MacDonald, professor of immunology at BartsAnd the London medical school.

但是55岁后肠道，尤其在大肠中的益生菌含量明显下降，免疫学教授Tom MacDonald介绍说。

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To date, CRISPR has been the most effective method for dividing cells in large organs like the skin or the gut.

对皮肤、肠道等较大的器官来说，CRISPR是迄今为止最有效的细胞再生方法。

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"When you have something this large, my gut would tell me that there's something traumatic that happened, " Sue Rocca, a marine biologist with the Whale and Dolphin Conservation Society, told CNN.

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When lawyer Susan Pravda found herself unable to choose between BNY Mellon and another large institution, she went with her gut.

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