upward mobility
noun /ˌʌpwəd məʊˈbɪləti/
  /ˌʌpwərd məʊˈbɪləti/
[uncountable]- movement towards a higher social position, usually in which you become richer走向上层社会的;走向富裕的;步步高升的 - a society which encourages upward mobility鼓励向上流动的社会 
- Education was the key to upward social mobility.教育是提高社会地位的关键。 
 
- a society which encourages upward mobility