Nearly 40 years later, the Michigan arborist has returned to the region to realize his dream of preserving and restoring the most ancient of these trees using the latest advances in genetic cloning.

• 将近40年过去了，这位密歇根的树木栽培家又返回该地区，拟用基因克隆的最新进展，实现他保护和重建最古老的树木的梦想。