灯芯

例句：

1. 1. The candle's wick is burning out.
   烛光的灯芯快要燃尽了。
2. 2. The old lamp was too dim to read by.
   旧灯太暗，无法阅读。
3. 3. The filament in the lightbulb flickered and went out.
   灯泡里的灯丝闪烁了一下然后熄灭了。