Huge palaces were built by slave labour.

宏伟的宫殿是奴隶建成的。

I left because the job was just slave labour.

我之所以离开是因为那工作简直是奴隶干的。

He's been forced into slave labour at burger bars to earn a bit of cash.

为了挣点小钱，他被迫到汉堡吧去打工。

Typing at that salary is slave labour.

干薪金那么低的打字工作等于做苦工。