noun · An unlicensed or clandestine brick kiln operating outside of legal and safety regulations.

警方在偏远山区查封了一座生产劣质砖块的黑砖窑。

noun · Illegal production sites, primarily kilns, notorious for exploiting forced labor, particularly following the 2007 scandal in China.

黑砖窑奴工案的曝光引发了社会对非法用工的高度关注。