In other words , random numbers generated over and over using barnsley 's fern formula ultimately produce a unique fern-shaped object .
换句话说，就是重复利用巴恩斯利蕨类公式所产生的随机数可以形成一个蕨类形状的独特物体。
They studied how their ancestors pounded fern roots into flour , made snowberries into medicine and smoked salmon over alder wood fires .
他们学习了自己的祖先如何将蕨类植物的根捣成粉，将白浆果制成药物以及如何在燃烧的桤木火焰上熏制鲑鱼。
385 Million b.c. during the middle devonian period of the paleozoic era , a prehistoric fern adds a new growth ring to its trunk , creating the world 's first timeline .
