Ali baba followed them with his eyes as far as he could see them ; and afterward stayed a considerable time before he descended .
阿里巴巴一直用眼睛看着他们直到看不见了;在他下来之前他留在上面相当长时间。
It is 150 years since the publication of charles darwin 's theory of evolution , which suggested that all living things are related and that everything is ultimately descended from a single common ancestor .