我发生了事故 I was in an accident ; I had an accident
这里发生了一起事故 Here there was an accident ; Accident happening here ; Here there was accident
昨天发生了一起事故 Yesterday there was accident ; An accident had occurred yesterday
昨天发生了一场事故 An accident occurred yesterday
昨天发生了一个事故 Yesterday there was an accident
他发生了严重的事故 Something serious has happened to him
前面发生了交通事故 A car accident ahead
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