以下为句子列表：
英文: Finding a reasonable candidate for an impact crater marked a turning point in the search for the causes of extreme climate perturbations and mass extinctions—away from earthly sources such as volcanism and toward a singular, catastrophic event.
中文: 针对地球上气候大变动、生物大灭绝的研究，从此发生了重大转折，因为学者找到了一个合理的陨石撞击点，就不再只是著眼于地球内部的肇因，例如火山活动，他们开始认为整个事件源自非比寻常的大灾变。
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英文: The topographic map produced by Clementine's laser ranger revealed the astounding dimensions of the SPA basin, which stretches 2,600 kilometers across, making it the largest impact crater in the entire solar system.
中文: 克莱门蒂号的雷射测距仪制作的地形图揭露出SPA盆地惊人的大小：宽达2600公里，是整个太阳系最大的撞击陨石坑。
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