几起几落 meaning in English

several ups and downs

In the history of mathematics education , the viewpoint on the importance of the mathematics application has changed many times
关于数学应用教育的定位问题，在国内外数学教育史上几起几落，几度变更。
Since the establishment of diplomatic relations between the two countries , sino - u . s . relations have undergone ups and downs , and even have encountered some major setbacks that could be called " crisis "
自从中美建交以来，两国关系几起几落，甚至曾经遭受过可以称得上是危机的重大挫折。
For various reasons , the cooperative medical system disintegrated rapidly . it was a insight task to establish a medical treatment system for peasants that adapts to our country social and economy level . combining to our country social and economy
然而,由于种种原因,合作医疗在我国几起几落,为农民建立一个什么样的,与我国社会经济发展水平相适应的医疗保障体系是至今还未解决的一个重要课题。