betterment
/ˈbetəmənt/noun
mass noun
1- the improvement of something改善, 改进, 提高：
they believed that what they were doing was vital for the betterment of society.
他们相信他们正在做的事情对社会改良至关重要。
1.1
- the enhanced value of real property arising from local improvements（因当地环境改善而产生的）（不动产）增值：
as modifier a betterment charge.不动产增值税。