betterment的复数形式怎么写

betterment的音标：betterment的英式发音音标为：['betəmənt]betterment的美式发音音标为：['betərmənt]...

His research is for the betterment of mankind.他的研究是为全人类造福。Anyway, regardless of the resolution , we are all making a commitment toward betterment.不管怎么说, 别提决心, 我们都在保证朝着更好努力.I appreciate his many contributions to the bette...

n.改好，改良，改进...