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- vi. 爬上树未考
n. 树，树状物45 次
The team reconstructed the animals’ evolutionary tree and used computer models to pinpoint the domestication event when herders in Kenya and the Horn of Africa tamed wild asses.
该团队重建了这些动物的进化树，并利用计算机模型精确定位了这一驯化事件——当时肯尼亚和非洲之角的牧民驯服了野驴。
But when Swetnam enrolled in graduate school at the University of Arizona’s Laboratory of Tree-Ring Research, he was surprised to find a record of repeated blazes dating back hundreds of years before European colonists arrived on the continent.
但当斯韦特纳姆进入亚利桑那大学树木年轮研究实验室读研究生时，他惊讶地发现了一份反复发生火灾的记录，这些记录可以追溯到欧洲殖民者抵达这片大陆之前的数百年。
Some of the trees he analyzed bore more than 20 fire scars among their rings.
他分析的一些树木的年轮中留有20多处火疤。
The fact that fires happened so often meant they couldn’t have been severe enough to kill most trees.
火灾发生得如此频繁，这意味着它们不可能严重到足以烧死大部分树木。
They rid the forest of dead and sick trees, reducing competition and curbing the spread of disease.
它们清除了森林中枯死和患病的树木，减少了竞争，并遏制了疾病的传播。
In 2022, Swetnam and other scientists teamed up to compile a database of fire-scarred trees from across the continent.
2022年，斯韦特纳姆和其他科学家合作，汇编了一个涵盖整个北美大陆带火疤树木的数据库。