One day the hare proudly challenged the turtle to a race .
有一天兔子骄傲的向乌龟挑战赛跑。
例：One day I had dinner with her at that restaurant. (过去时)
有一天我曾和她在那家餐厅吃晚饭。
One day the little boy will be a great man .(将来时)
有一天这个小男孩会成为伟人。
tips：
例：Someday the little boy will be a great man.
=One day the little boy will be a great man
有一天这个小男孩会成为伟人。
例：The other day I met him at the train station.
前几天我曾在火车站遇到他。
以上这些副词或者状态均可置于句首或句尾。
The little boy will be a great man someday.
The little boy will be a great man One day.
I met him at the train station the other day.
In the end , he was rewarded for his perseverance .
最后，他因坚韧不拔的精神而获得回报。
in the end 到最后
=at last
in the beginning 起初
=at first