例句：
1、An improvement in living standards could be years away.
可能多年之后生活水平才能得到提高。
2、This may have been an improvement, but "breakthrough" was an overstatement.
這算得上是一個改進(jìn)吧，但說是“突破”就言過其實了。
3、Doctors say he has made a slight improvement.
醫(yī)生說他的病情稍有好轉(zhuǎn)。