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.

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该组织目前的研究重点是海岸红杉和巨杉。

The group's focus is on coastal and giant sequoias.

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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.

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