This recalcitrance, combined with the fact that almost no effort was devoted to studying the yew's natural history in the past, adds to the difficulties today of regenerating the yew.
一篇林試所的論文如此形容，加上過去幾乎未對紅豆杉生活史投入心力，也加深了今天復育紅豆杉的困難度。