3D来自日语的3K,又脏又危险又累的工作
"Dirty, Dangerous and Demeaning" (often "Dirty, Dangerous and Demanding" or "Dirty, Dangerous and Difficult"), also known as the 3Ds, is an American neologism derived from the Asian concept, and refers to certain kinds of labor often performed by unionized blue-collar workers.
The term originated from the Japaneseexpression 3K: kitanai, kiken, kitsui[1](respectively 汚い "dirty", 危険 "dangerous", きつい "demanding"), and has subsequently gained widespread use, particularly regarding labor done by migrant workers.