1. The man worked hard for his own betterment and presently was given a responsible position . 那个人为求升迁而努力工作，没过多久就获得了一个有权的职位。
2. It appeared for several decades that the promise of change and betterment might come about from the National Congress. 在几十年的时间里，国会的变革和改良的承诺貌似真的就要实现了。
3. Objective: To obtain a high effect for a long time, we think incision betterment could make outer -canthus more stand and trustiness. 目的：为了提高上睑皮肤松垂矫正的远期效果，使之成为一种稳定持久、外眦部平展的重睑术。
英英解释
n.
1. a change for the better; progress in development
2. an improvement that adds to the value of a property or facility
3. the act of relieving ills and changing for the better
