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.

• 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。