When Tom Swetnam joined the u.s. Forest Service in the 1970s, his mandate was to "put everything out," he recalled.
当汤姆·斯威特纳姆在1970年代加入美国林业局时，他的任务是“把所有东西都扑灭”，他回忆道。
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.
但当斯威特纳姆进入亚利桑那大学的树木年轮研究实验室读研究生时，他惊讶地发现，早在欧洲殖民者到达大陆数百年之前，就有重复的火灾记录。
In 2022, Swetnam and other scientists teamed up to compile a database of fire-scarred trees from across the continent.
2022年，Swetnam与其他科学家合作，编制了一个涵盖整个大陆的火疤树木数据库。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。