slave

History books explain how thousands of slaves were forced to work on large plantations.

(Chinese) 历史书解释了成千上万的奴隶是如何被迫在大种植园工作的。

Abraham Lincoln is famous for his efforts to free the slaves in the United States.

(Chinese) 亚伯拉罕·林肯因其解放美国奴隶的努力而闻名。

I've been slaving away in the kitchen for five hours to prepare this holiday feast.

(Chinese) 为了准备这顿节日盛宴，我已经在厨房里拼命干了五个小时了。

He spent the entire weekend slaving over his final research paper for university.

(Chinese) 他整个周末都在为大学的毕业研究论文而辛苦工作。