这些在长寿物种，如巨红杉中留下的火灾印迹，使得他能够估计过去森林火灾的频次。
Such "fire scars" in long-lived species like giant sequoias allow him to estimate the past frequency of forest fires.
该组织目前的研究重点是海岸红杉和巨杉。
就红杉来说，沃纳先生使用一截一截的树芽和其它植物材料，包括从巨杉顶部截下来的一些木块。
In the case of the redwoods, Mr. Werner used small cuttings of sprouts and other plant material, including some cuttings from the upper reaches of giant sequoias.
就红杉来说，沃纳先生使用一截一截的树芽和其它植物材料，包括从巨杉顶部截下来的一些木块。
Werner used small cuttings of sprouts and other plant material, including some cuttings from the upper reaches of giant sequoias.
就红杉来说，沃纳先生使用一截一截的树芽和其它植物材料，包括从巨杉顶部截下来的一些木块。
Werner used small cuttings of sprouts and other plant material, including some cuttings from the upper reaches of giant sequoias.
应用推荐