the improvement of something
改善,改进,提高
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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。
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
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[as modifier]
a betterment charge. 不动产增值税。