Redwoods grow back into themselves as they expand into space, and this flying buttress is a limb shot out of that small trunk, going back into the main trunk and fusing with it.
红杉向周围空间延伸的时候同时也向自身生长， 这个飞拱就是那根小树干长出的一根树枝， 它向主干生长，与之糅合。