the ebb and flow

phr

• ① (潮的)涨退<of>
  • the ebb and flow of the sea海潮的涨退

• ② (事业、人生的)盛衰<of>
  • the ebb and flow of life人生的浮沉
  • in the ebb and flow of political struggle在政治斗争的成败中