Everyone on planet earth, it seems that there is discrimination, frequently racial or socio-economic. When explaining discrimination in the USA, in addition to racial discrimination, I also like to explain that there is social-economic discrimination between people of the same skin color, just as there is in China…
Trailer trash (or trailer park trash) is a derogatory North American English term for people of low socio-economic standing. The term originates from the belief that those of low standing within society often reside in trailers or mobile homes, especially in trailer parks. Because trailers often provide housing at a lower cost than conventional foundation-built houses, and some trailers have few amenities, there is a popular cultural conception that those who live in trailer parks are usually only those who are too poor to afford anything else. Although trailer parks have a high density compared to other rural or suburban housing, they are usually created on large tracts of undeveloped land in rural or suburban areas.
美国社会是有贫富差别，但整体社会生活水平并不很低。美国文化是鼓励人人奋斗，争取富有，穷人成功的致富机会也是大有存在，例子很多。但是有些人是不想工作不愿付出辛苦，自愿选者过那种“拖车活动房屋垃圾”的生活方式，这也是他们被社会歧视的原因之一，并不完全是因为他们贫穷。[From 【原】 你可以把这样的房车当家吗？- Can you make a motor home a home? – OC*OC* 的日志 – 网易博客]