one moment ... the next/from one moment to the nextused to say that a situation changes very suddenly, often in a way which you do not expect or cannot explain 一会儿…过一会儿/紧接着〔表示形势变化之快出乎意料或无法解释〕 One moment she’s kissing me, the next she doesn’t want to see me again. 她一会儿亲我,一会儿又不想再见到我了。
You never know what’s going to happen from one moment to the next. 你永远不知道接下来还会发生什么事。
→ one moment ... the next/from one moment to the next at moment(7)