求翻译：当时种族偏见盛行，奴隶制还没有被废除。南方有好几个州都规定，凡逃跑的黑奴被抓，其主人可以严厉处置他们。这些黑奴受尽奴隶主的压迫，终于不得不决定冒着巨大的风险逃离种植园。他们充分利用各种方法伪装自己：有的在夜色的掩护下赶路；有的用白粉涂在脸上；还有的把脸用面纱完全遮住。其中少数人联系上了历史上著名的“地下铁路”组织，到达了安全之地，从此获得了解放。但也有人很不幸，被抓回到种植园，受主人虐待，干活时被迫戴着脚镣。是什么意思？

At that time the prevalence of racial prejudice, slavery has not been repealed. There are several Southern states, where the escape of slaves was arrested, the owner can dispose of them severely. The slaves suffered the oppression of the slave, and finally had to decide at great risk to flee the pla

racial prejudices prevalent at that time, slavery was not abolished. The South, several States have provided that the black slaves who escaped were captured, their owners can severely dealt them. These black slave masters who have suffered so much from the oppression, and finally had to decide at en

At that time the race prejudice was in vogue, the slavery has not been abolished.South has several states all to stipulate, every escapes the black slave is caught, its master may handle them severely.These black slaves experience suffering slave-owner's oppression, finally can not but decide takes

Racial prejudice prevalent at that time, slavery has not yet been repealed. There are several southern States provide that where caught runaway slaves, their owners can severely dispose of them. These black slaves subjected to slavery and oppression, finally have to decide at huge risk fled the plan

Racial prejudice prevalent at that time, slavery has not yet been repealed. There are several southern States provide that where caught runaway slaves, their owners can severely dispose of them. These black slaves subjected to slavery and oppression, finally have to decide at huge risk fled the plan