Their North American tree-ring fire-scar network (NAFSN) provided the basis for a study published last month.
他们的北美树木年轮火疤网络（NAFSN）为上个月发表的一项研究提供了基础。
The NAFSN sites experienced less than a quarter of the number of fires that would have been expected without fire suppression.
NAFSN的监测点经历的火灾数量不到没有火灾压制情况下预期数量的四分之一。
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。