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lv se sa ha la he zao qi ren lei qian zuo
Pages: 9
Year: Issue:  12
Journal: Ocean World

Abstract: <正>由来自荷兰皇家海洋研究所和德国不来梅大学的科学家组成的研究小组发现,撒哈拉沙漠和北非萨赫勒地区曾发生过重大的气候变化,并促使早期人类从非洲大陆到世界各地的迁徙。
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