视频对白:

They're used as a wick to keep him going.
被当作灯芯让他继续表演。

wick

n.蜡烛芯；（油灯的）灯芯

Not a problem-we've got wick replacements right here.
不是一个问题，我们已经有了在这里更换灯芯。

It's very hard to turn the wick up and down.
这灯芯很难旋上旋下。