英语翻译But then,the last time I smiled was when I heard my grea

英语翻译But then,the last time I smiled was when I heard my great-uncle had got run over by a bus while he was fishing on a river bank (I inherited his rather fine fishing rod,which was fortunately undamaged),and that was 47 years ago.【先来一下我的粗糙翻译】但那个时候,也就是我最后一次笑啦,就是我的大伯在他小河的岸边钓鱼时,给一车车撞了（我收遗了他的还蛮相当精美的一根钓鱼竿,这杆子非常幸运,还未被轧坏）.这个事情,已经过去47年啦!【我的疑问】我想,我已经把意思大致翻译出来了.然后,让我莫名其妙的是,大波被车撞死,为啥我就会笑呢?然后,还是我平生最后一次微笑?我实在搞不懂啦.尽管此话是老外说的,我还是莫名其妙,我是真的想不通啦.希望高手给我解疑答惑,