英语语法分析

In the 19th century it was called indentured servitude.

在19世纪被称作劳役。

He underwent nineteen years of penal servitude for theft.

他因犯了大窃案受过十九年的苦刑。

Requesting indentured servitude from (still) three of the most powerful men in the world.

要跟三位（现在还是）世界上最有权力的人物签卖身契。