其他机制更可能是较为循序渐进的，在更长时间段或在不同的大陆上的不同时间发生。
Other mechanisms would be more likely to have taken place more gradually, over an extended period, or at different times on different continents.
研究人员研究了东西伯利亚北极大陆架，西伯利亚以北的北冰洋的一段。
The researchers studied the East Siberian Arctic Shelf, a section of the Arctic Ocean just north of Siberia.
使用这个标记，他已经建立了从泰国和越南的一系列树木年轮年表，以表明在十五世纪早期横贯大陆和东南亚的一段严重的干旱期。
Using it, he has built up a series of tree-ring chronologies from Thailand and Vietnam that indicate a period of severe drought across mainland South-East Asia in the early 1400s.
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