1.Pyongyang said this was the first in a series of actions against Seoul.
a series of 一系列
Frustration, anger and desperation have led to a series of wildcat strikes.
挫败感、愤怒和绝望引起了一系列自发性的罢工 。
2. They sometimes put little parcels together with rice, but they also include anti North Korean regime leaflets, some of which are particularly unkind to Kim Jong-un.
put together 组合
He took it apart brick by brick, and put it back together again.
他一块砖一块砖地把它拆开,然后又把它组合起来 。
3.The Bank of France forecasts a deep decline this year, with economic activity returning to pre-pandemic levels only in 2022.
return to 返回
They cited Alex's refusal to return to the marital home
他们引证了亚历克斯拒绝回到婚后的家中一事 。