烛芯

例句：

1. 1. The candle was nearly burned out when it fell to the floor.
   蜡烛掉到地上时几乎烧尽了。
2. 2. The old man carefully placed the wick of his pipe in the center of the fire.
   老人小心地把烟斗的芯放在火中央。
3. 3. The wick of the candle flickered as it burned down.
   蜡烛的芯在燃烧时闪烁不定。