For example, slavery was abolished in the nineteenth century, but still in the twentieth and twenty-first centuries the Working Group on Contemporary Forms of Slavery has dealt, year after year, with many situations in which this practice has not been eradicated.
例如，奴隶制在十九世纪被废除，但是，到二十和二十一世纪，当代形式奴隶制问题工作组仍然年复一年地处理许多尚未消除奴隶制的情况。