A wave of sadness ran through me as I realized that she must have thought she was writing to her father.

一阵悲伤在心间掠过，我意识到她一直以为是跟自己的爸爸聊天呢。

youdao

We all experience a number of emotional fluctuations throughout the day, and often we don't even understand what's causing a wave of anger or sadness.

人们平常都会遇到一些情绪波动，而且往往并不清楚愤怒或难过背后的原因。

youdao

Lt Col Colin Weir, commanding officer of the 1st Battalion, said his death had "sent a wave of shock and sadness through this battlegroup".

BBC: RIR soldier to be buried alongside baby daughter