a labour of Hercules

见 Hercules

a labour of love

a task done for pleasure, not reward

心甘情愿做的工作

labour the point

explain or discuss something at excessive or unnecessary length

不厌其烦地解释（或讨论）

labour under

carry (a very heavy load or object) with difficulty

费力地搬（重物）

be deceived or misled by (a mistaken belief)

被（错误想法）蒙蔽（或误导）

you've been labouring under a bit of a misapprehension.

你被一点点误会蒙蔽了。