Because Mongolian citizens can stay in China for thirty days without registration or need for a visa, many of the prostitutes have been there for many years and return to Mongolia once a month.
由於蒙古公民可以在中國停留三十天而無需登記或需要簽證，因此許多妓女已經在那裡待了很多年並且每月一次返回蒙古。