突然有一天

Perhaps a design works so well. It is adopted elsewhere again and again, with seemingly harmless improvements, until, suddenly, it does not work at all anymore.

一种设计效果很好，反复应用于其他地方，加上一些看似没什么影响的改进，突然有一天它就不奏效了。

Suddenly one day, Bonnie was killed for riding.

可是，突然有一天，邦妮骑马摔死了。

Then, suddenly, there were only two bunnies in the cage.

突然有一天，笼子里只有两只兔宝宝。

Out of the blue, my mother came to visit one day.

突然有一天，妈妈来看我。

Suddenly one day, I was scared something stunned.

突然有一天，我被某些东西吓得目瞪口呆。