follow/steer/take the middle course/way/path idiom
走中间路线；采取折中的办法；取中庸之道
to act in a way that is not extreme and that you consider will cause least harm
Most parents steer a middle course between strict discipline and letting their kids run wild. 大多数父母采取折中的方法教育子女，对他们管束既不特别严格，也不放任自流。