A piece of the Yule log would be saved to start the next year's bonfire, seen as a symbol of continuity.
一块圣诞节原木将被保存下来,作为明年篝火的开始,被视为连续性的象征。
英语百科
Yule log
The Yule log, Yule clog, or Christmas block is a specially selected log burnt on a hearth as a Christmas tradition in a number of countries in Europe. The origin of the folk custom is unclear. Numerous scholars have observed that, like other traditions associated with Yule (such as the Yule boar), the custom may ultimately derive from Germanic paganism.