旁边又跨上一行小字儿

сбоку добавить ещё одну колонку (строку) мелкими иероглифами

当时，奴隶只是一件财产，他们和马儿、猫儿一起列在税册上，在收税人的册子里，每个奴隶的名字旁边写着他们的价值。

The slaves were property they　were on the tax books along with horses and cats, the valuation　of each slave written next to his name in the tax assessors books.