In his play Macbeth Shakespeare has his three witches hovering over their mystical brew chanting “double, double toil and trouble; fire burn and cauldron bubble.”

在莎翁的戏剧《麦克白》中，他写到有三个巫婆围着她们的魔药，并且吟唱着：“不惮辛劳不惮烦，釜中沸沫已成澜”。

youdao

It is mighty curious, Huck. I don't understand it. Sometimes witches interfere. I reckon maybe that's what's the trouble now.

这就怪了，哈克。我真搞不懂。有时候，巫婆会暗中捣鬼。我猜问题出在这儿。

youdao

It doesn't take much imagination to see where Macbeth's Three Witches of Eastwick, casting toil and trouble from their hill, might have come from.

BBC: Following in the Bard��s footsteps �C literally