At one time, a foreign ecologist decided to train his focus year round upon a thousand-year-old tree, studying its relationship to the plants and insects it supported. It turned out that nearly 1,000 different kinds of insects grew on the tree, and in a lifetime he'd never be able to complete the research.
國外曾有生態學者將自己終年掛吊在一棵千年大樹上，研究樹上的昆蟲與植物間的關係，結果發現該棵樹上生存著近千種昆蟲，一輩子也研究不完。