THE PURCHASER of a black servant was persuaded that the color of his skin arose from dirt contracted through the neglect of his former masters. —
一个黑奴的购买者被说服，认为他的皮肤颜色是由于前任主人的疏忽而引起的污秽。 —

On bringing him home he resorted to every means of cleaning, and subjected the man to incessant scrubbings. —
带他回家后，他采取了各种清洁方法，并对这个人进行了不间断的擦洗。 —

The servant caught a severe cold, but he never changed his color or complexion.
这个仆人患了严重的感冒，但他的肤色从未改变。

What’s bred in the bone will stick to the flesh.
血液中的遗传品质将贴于肉体。