since

• 解放以来

  since liberation

• 建国以来

  since the founding of the People's Republic

• 几年以来

  over the past few years

• 长期以来

  for a long time

• 今年以来

  in the past year

• 开春以来

  from the beginning of spring

• 有生以来

  ever since birth

• 自古以来

  since ancient times

• 半个世纪以来

  in the last half century